How to use Apple Photos

last update: 4 March 2022

Recently I looked at my photo collection and was amazed to find not only that I had more 20,000 images, but also that I had stopped organising them more than 3 years ago (how time flies).

In fact I had not really made much effort since
iPhoto had been replaced by Photos in 2014.

So this webpage is less a 'how to' and more a walk through about what I learned as I tried to clean up my photo collection. The easy part was deleting around 4,000 images, but that still left more than 16,000 to look after.

Rome wasn't built in a day, and nor was my photo collection. But every time I opened Photos I had to discovered another answer to another question.

The situation was exasperated by both the need to figure out the best way to include a scanned photographs, and the move to a new 2021 MacBook M1 Pro.

Repair Photo Library

On the 4 March 2022 I visited my photo collection again, with the objective to delete some unwanted photos, and do some work on locations, dates, etc. on some newly scanned photographs.

What I found was that some photos had lost the
id's of faces, and some others were now wrong. In addition, in some cases the id's of faces appeared to be randomly distributed over the photograph. I tried to move the id circle but couldn't, nor could I delete an incorrect name or location.

I also questioned my use of title, etc., and I needed to start using '
People' and 'Keywords' more consistently, as well as adjusting dates and using 'Places' on my scanned photographs.

Frankly, I'm not sure about the origin of these problems. Was it because I tried to move bit-by-bit to my new MacBook Pro (rather than just use the
Migration Assistant), or was I just seeing problems that were present in the past and became more visible as I looked to cleanup my photo collection.

The failed attempts at correcting the problems included closing and re-opening Photos, and shutting down the Mac and re-booting, but all to no avail.

After a few failed attempts to understand the problem, I searched with "mac photos face id not working properly", and found a
Q&A on the topic.

The Q&A provided a number of options, and I went immediately for the
Photos Repair Library tool. I check after running it, and there appeared to be still some problems, so I ran it again. I also went though the other suggestions, in the hope that things would miraculously repair themselves.

Problems and Solutions with Photos Repair

I had changed the date on some photos and added a id of a face (one that I thought I had already added sometime ago), and after the repair I found them with the date 01.01.48 and not 01.01.1948, but the id had worked. Was this my error, or a Photos error? Probably my error, but it was easily corrected.

On one set of photos I had to input id's of faces again, but after the repair it looked like things had returned to 'normal', but not quite…

Some changes in location were properly carried over after the repair.

On two photos I had inserted new id's, but they were lost after the repair.

I changed the date on one photo, and the people id disappeared, and had to be re-attached.

On a set of black and white wedding photos, the id's were shown in the 'Info', but initially not on one of the photos. When returning to the photo, the names appeared on the photo!

One series of photos were fine before the repair, but after the repair they had lost the id's for myself and my wife (all except on one image). We were not longer on the 'Info' pane, yet the faces of everyone else were properly identified.

On another series the id of my wife had disappeared on some of the photos (and this was an id that had been set some years ago).

In some cases the id's were still in the 'Info' pane, but not on the photo. In some cases the id had also disappeared from 'Info'. It appeared that when the id was still in the 'Info', it might occasionally not be visible on the photo on a first visit, but would then re-appear later when returning to that same photo.

On one set of wedding photos with lots of id's included, about half had disappeared from the 'Info' pane and the photos.

On one family portrait photo dating from 2003 the id's had simply disappeared. This was the most telling sign that something had happened and that the repair had not been 100% successful. The question was now about the stability of Photos from now on. Were these problems going to reappear? Would I be wasting my time inputting new info., only for part of it to be corrupted at some later date?

My best idea was to focus on a sub-set of images, make sure they were properly tagged, titled, keyworded, and with face id's inserted properly. I could then see if that sub-set was stable, and visible (properly tagged) in iCloud Photos, and on my iPad and iPhones.

'Back to Basics' on Apple Photos

I started with the Photos
User Guide.

In the introduction we are told that we can assign titles and captions to photos, add or change the location of photos, and change the date and time information for them. And we can select multiple photos and add or change information about them all at once.

We can
organise our photos with the Photos app, browse through the image library, and search for people and places, etc.

In the user guide we are told that we can view and add information about our photos, e.g. we can see the date and time a photo was taken, information about the camera that took the photo, and badges that indicate the state of the photo.

In the
'Info' of a photo we can edit title, caption, mark it as a favourite (and unmark), add and remove keywords, add a name to a face, and enter/change a location (and drag the pin).

Below we have an 'Info' example, about an image taken on a beach in southern Spain. We can see that some information is added automatically by the camera, and some information can be optionally added by the owner.

The 'IMG_2806.JPG' is a default, with digital cameras starting off with a base filename and increment a post-pended number with each exposure (DSC_nnnn.JPG is another default option). Of course if you have two cameras, or occasionally change cameras, you can easily find two or more images called 'IMG_2806.JPG'. And remember, once it gets to IMG_9999.JPG, it will start again at IMG_0001.JPG. Almost everyone leaves the IMG_ intact, and you can find thousands of IMG_2806.JPG on Google (its a kind of snapshot of our civilisation). Professional photographers who take 1,000's of images using several cameras will certain want to customise image naming, so that they can find unique images in massive collections. And some collections might have to manage many photographers, each with a slightly different way of managing their individual photo collection.

Example of Apple Photos Info

My digital image collection starts with DCS00001.JPG, taken on 6 July 2001 with a Sony Cybershot. But as far as I can see transferring the images to the computer, and deleting them from the camera meant that it would always starting naming the images all over again with DCS00001.JPG. On 5 October 2003 I bought a Minolta DiMAGE Xt in the Auckland duty free, and images started to be named from PICT0001.JPG. I took my first photo with a Sony Ericsson K800i on 1 December 2006, and images started (again) with DSC00001.JPG. I bought a Sony DSC-T100, again in a duty free, on 30 March 2007, and images started to be also named DSC00001.JPG. On 19 October 2009 I started to take photographs with a Sony DSC-T90, starting again with DSC00001.JPG, and I took my first photograph with an Apple iPhone 3GS on 29 November 2009. This time image names started with IMG_0001.JPG. On the 19 May 2011 I took my first photograph with an Apple iPhone 4, always starting with IMG_0001.JPG. On 29 September 2013 I took my first photograph with an Apple iPhone 5, again starting with IMG_0001.JPG, and from 23 October 2014 I exclusively used the iPhone 5 to take photographs. I swapped to an Apple iPhone 6 on 22 August 2016. I did use a Sony DSC-W830 from 8 December 2017 to 28 February 2020 (so back to DCS00001.JPG), but also from 29 November 2018 I started to use in parallel an Apple iPhone 8 (starting with IMG_0001.HEIC). And from the 10 December 2021 I moved to an Apple iPhone 12 Pro, but interestingly the IMG continued on and was not reset to 0001. One of the best things about Sony cameras is that it has always been possible to sell them, although I still have my Sony DSC-W830. Along with the Apple iPhone 12 Pro I still use the Apple iPhone 8 and my wife has a 2nd-gen Apple iPhone SE and her own photo collection stored on her own iCloud.

One professional I came across used image names such as '20040323_1005-e.jpg', i.e. date, original camera IMG number, and -e meaning edited. He also used for naming scanned photos, '19980500_r4432_10-e', e.g. estimated date of original photo (00 for unknown) followed by _r for roll of negative film and _s for slide, roll number or slide number, and -e for edited, -s resized, and no suffix for originals (-e3 would be the third edit). Other suffixes could be used, e.g. -ew or -sw for the web, or -ep and -sp for prints, etc. Based upon the
comments there are quite a number of alternative ways to name images (as opposed to titles, captions, alt-tags, etc.). Our professional also advised to place images in folders by date (2004-01-21). So a single image might appear as 2004-01-21\20040121_r3201_15-e.jpg, for an edited version of the 15th image on role 3201, with an original attributed date of 21 Jan. 2004.

The IMG_ is just the tip of an iceberg of other information that is hidden but attached to any digital image. This information is called
metadata, and for images there is a specific format for the information called EXIF for 'exchangeable image file format'. This is a standard that specifies the tags placed on images taken with digital cameras, including smartphones. In our example above, we have already mentioned the IMG_, and we can see the .JPG extension for the image compression standard used (including a JPEG 'badge'). We can see the date and time when the image was taken, the X-Y resolution in pixels, the ISO number (a 'film speed' number with 32 being used by some smartphones in an attempt to have less noisy images), the exposure time (s), the F-number, the focal length (mm), the file size (MB). The 0v refers to 0 exposure compensation. The other two 'badges' we see in the Apple iPhone 6 window indicate that white balance was automatic, and the crosshairs describes the metering mode, or the way the camera determined the image's exposure. These badges are different from the 'badges' mentioned in the Apple's description of Photos.

ISO is a measure of how sensitive the image sensor in the camera is to the amount of light present. The higher the ISO, the more sensitive the image sensor is, which increases the ability to take pictures in low-light situations or at faster shutter speeds in normal lighting.

Exposure compensation allows the camera to automatically brighten or darken images to get the best picture possible. A number followed by the letters EV designates exposure compensation. In this case, the photo’s exposure compensation was 0.

White balance is the process that ensures that images don't appear tinted blue or orange, and that whites appear as white and the colours as 'neutral', i.e. the colour temperature is natural.

Metering mode is the way the camera determines exposure, i.e. by a spot location, by a weighted-average over a central region, by monitoring multiple zones, etc. What the iPhone camera needs to do is figure out the correct exposure for a particular scene and adjust to it. It judges the amount of light and sets the ISO, shutter speed and aperture to get the best exposure. The symbol we see in the above graphic is the matrix or evaluation mode, one of three potential modes, the other two being centre weighted and spot metering (see this useful description).

Image Title
As far as I can see the best practice for image titles is to keep them short, avoid meaningless names and don't over stuff them with keywords. Whilst 'artists' might look for a title that captures the 'essence' of an image, I focus on factual information, e.g. wedding of …, Milan Cathedral, Playa Sancti Petri, etc.

As far as I know image titles are not used for search ranking, etc., and I understand that Google, etc. use the so-called 'alt-tag' (alternative text) to get a better idea about the subject of the image (
W3C has guidelines on alt-tag).

Also as far as I know image titles can be the same, but 'alt-tags' could/should be more customised to ensure a search finds the most appropriate image, e.g. "fine weather on empty beach in Sancti Petri".

Interestingly, some experts suggest to include keywords in the image file name, which would certainly fit with things like "wedding of …" since the names would be keywords. However, for me Playa Sancti Petri would be searchable in the image title, and I can't see a need to explode keywords for 'playa' and 'Sancti Petri' and add 'Spain', 'Andalusia', 'holiday', '2018', 'beach', etc., when directly or indirectly this information is already 'attached' to the image elsewhere.

Caption is optional, and is best used as a descriptive of what can be seen in the image. At least in one example the caption was a few words about why the photographer took that particular image.

Many people ask about the difference between title and caption. At least one 'definition' that makes sense for me is that the title is a single-line shorthand reference that could usefully sit under the image. Whereas caption is a longhand description of the images contents. One option could be that a series of images would be titled "wedding of …", and the captions might describe church ceremony, taking the vows, signing the register, bridesmaids, the reception, etc. I am assuming that along with this, the date, location and face id is also used, covering the when, where and who.

In one of my first examples I found that Places did not write the exact address into the location field, so I placed the exact address in the caption. I input the exact address, and the 'pin' was placed at, or very near, that exact address, but the location field on the 'Info' pane just marked 'town, country'. I adopted this as a general principle when the exact location had a precise address, such as a hotel, specific building, etc.

I always place the exact address (also) in the caption field.

Start by checking out "
Find photos by keyword in Photos on Mac".

Apple defines keywords as tags or labels that we add to our photographs to help us find them easily. So the idea is that you add the keywords, which are kept in a keyword manager, and then later you can search on them. As far as I can see there are a multitude of different ways to classify and search the Photos image library, and keywords can be another alternative way to classify and collect images into user-defined groups. So the real question is
why use keywords? And, as a subsidiary question, how best to use keywords?

Photo classification Photo Albums 1 Photo Albums 2

For example, photos are automatically classified into Library, Memories, People, Places, Favourites, Recents, Imports, Hidden, and Recently Deleted.

Library is the collection of all images, and by default is stored in the Picture folder. I keep my image collection in iCloud Photos.

Memories are automatically 'curated' (and set to music), and on the Mac you can 'personalise' them, i.e. edit the title, length (automatically adding or subtracting images), and selecting a 'key photo' to start the memory. On the Mac you cannot edit the selection of photos (but you can hide them), whereas in iOS you can alter the selection of images that compose the memory (see personalisation of memories in iPhone, …). Memories are just 'curated' slideshows, i.e. go to File>Create>Slideshow>Photos or Projects>My Projects>Slideshow>Photos. You can name a slideshow (which appears in My Projects), and 'add' selected images. There are a few themes, one piece of classical music, and some duration/transition options. Music can be added from the music library, and additional themes, etc. can be found in the App Store.

People has been described on a recent Apple Machine Learning blog. These are algorithms running privately on-device, to help curate and organise images, Live Photos, and videos. People can be recognised in an image, and the user can also manually add names to people in photographs. In addition, Memories can be created around a knowledge graph of identities and places, trips, events, etc. People is an example of automatic person recognition, which uses 'embeddings' (features) including faces but also upper body features (e.g. clothing, posture, etc.).

Places is what it says, iPhones and modern cameras geo tag photos with location data about the place where the image was captured. Places give you access to your photos located on a map (I guess centred on where the majority of images were taken). And you can zoom (click, click,…) down to an individual image or set of images. The 'Info' provides a small map, with the location indicated by a pin. The pin can be pulled and planted elsewhere, updating the location coordinates.

Favourites can be added, and appear with a small heart in the lower left-hand corner.

Recents are sorted by date and time, according to the most recent additions to the library.

Imports are sorted by date and time, according to the import session on that particular device.

Hidden permits you to control which photos and videos are visible and what's hidden.

Recently Deleted collects all intentionally or accidentally deleted photos or videos, and they are kept for 30 days.

Also Photos automatically classifies images into
media types, i.e. videos, panoramas, etc. These are a type of smart album, created automatically based upon the properties of the images, and cannot be changed (except possibly with a EXIF tool).

Shared Albums let you share photos and videos with just the people you choose, and they can add their own photos, videos, and comments. I don't share albums.

Projects allow you to create books, cards, calendars, etc., and including the use of
project extensions from the App Store (e.g. professional-quality prints). Slideshows appear as projects, and can be exported.

So the above features already allow users to find images using a certain number of pre-established criteria, e.g. people, selfie, etc., and of course using the
search bar.

Quick Fliter

In addition there is the quick filter option (above), including for recently edited photos, or keywords in the Keyword Manager. And the quick filter option is available for different media types, and in albums, shared albums, the Favourites album, the Imports album, the Recents album, etc.

So the question remains,
why use keywords?

Above we saw that there are pre-establish smart-search-like features, there is the quick filter option, and the
search bar.

So what kinds of searches are already available in the
search bar, without using keywords:-

  • You can search on every individual word in the title and the caption, e.g. a search on 'the' will find all titles starting with the word "The …", and all words starting with that sequence of letters 'The…..', whilst a search on 'the ' (with a space) picked up on the word within a title and dropped the letter sequence 'the…' inside a word, and ' the ' (two spaces) did its job and also dropped all the titles that started with "The".

  • You can search on the image name, e.g. DSC or 0067.

  • You can search on the date, e.g. 27 August 2004, 27 August, August 2004, August, 2004, etc., but it would appear you can't search on time (e.g. 10:34:58) with or without a date.

  • You can search on some Camera details, e.g. DiMAGE Xt, .jpeg, .jpg, the iPhone model, but not on resolution (4032 x 3024), ISO 32, file size, etc.

  • You can also search on every word in the location, e.g. Costa del Sol, Costa, Sol, and even 'del'.

In addition,
Photos has its own library of keywords, accessed through the search bar. We mentioned above that you can search for words in image titles, captions, location, people, etc., but you can also search for 'random' words such as "farm fields". I have not explicitly used either 'farm' or 'field' in any form of description, except for one small set of photographs tagged "half-timbered Jacobean farmhouse". The search term 'farm' picked up the four tagged 'farmhouse' images, plus three additional un-tagged images of fields (there were certainly many more similar looking 'field' images in my collection). Interestingly, a search with 'field' picked out just one image, a painting by Van Gogh in a museum, which bizarrely it had tagged as a 'paddy field'.

So how come Photos already has a built-in library of keywords? I have not found any details at all about this topic, but I do wonder if the Photos built-in library of keywords is not linked in some way to the keywords used in
Apple Search Ads.

There are a lot of guides and comments on how to use of keywords, but not much on the why? It also appears that some people are happy with having a whole menagerie of keywords, whist others mention using a 'restricted collection', but don't mention their reasoning or the type of keywords used.

A really cool way of looking at keywords, is to remember what we once wrote on the back of printed photographs. The information is so valuable later because it tells when, where, and even occasionally who and why. However, much of this information is already tagged on an image, but often not visible together in one place on the 'Info' pane.

But in my opinion there is a risk that the keyword collection balloons out of all proportion. One argument for using keywords is that you can create smart albums by searching on keywords. However smart albums can be build on filenames, names, dates, titles, etc., so photo descriptors don't need to be used as keywords.

Stepping back for a moment from my specific question about keywords. If we look at search, my impression is that generally I employ a
target-intent search most of the time, i.e. I have a target (product, place, object-type, etc.) with an intent to purchase, book, etc. Next comes topic-specific searches such as "history of Rioja wine", "keywords in Apple Photos", etc. And finally, the very occasional generic-discovery search, "holiday on the coast in southern Spain", where I expect to find a wide variety of options. You can see that the query itself moves from 1-2 words, to a 'closed' 4-5 words, and finally to an 'open' 5-8 words. With this in mind I was able to use a number of test words on Photos search:-
Dessert - 7 excellent hits (15 great hits for desert)
Cake - 5 excellent hits
Suit - 36 good hits (suitcase 1 wrong hit)
Tie - 22 good hits
Car - 166 surprising good hits, with some odd ones
Mercedes - 0 hits, surprising since there were some Mercedes in the 'car' search
Blue car - 335 hits, with lots of confusion with blue sky
Water - 699 surprisingly good hits
Bottle water - 1 hit for a wine bottle (0 hits for water bottle).

None of these search terms were used in titles, captions, people or locations.

My initial view is that keywords should be reserved for family-group names, my cars, etc. These are persistent concepts that cut across recognised search terms, or are unique identifiers known only to me. A few examples might be 'Mum & Dad', 'Sister's family', etc.
Place names might be more precise than that offered in the location field or equally more generic and covering more than one location, e.g. Andalusia. Although I place exact addresses in the caption field. Although caption might be a better place for this type of additional location information, rather than a keyword (again because it might balloon out of all proportion).

The real use of keywords came to me in testing their use on a small subset of images.

First subset of images
One set was 21 images from a visit to a European capital city. It included images of my wife, a local friend, visits to two major cultural sites (a palace and a famous park), sites seen on a river trip, a visit to the nations parliament building, and two photographs of the building in which I gave a talk.
For this particular set of images date and time,
People and Places did a good job of uniquely identifying all the images. Places took some work, because I need to actually identify the cultural sites, move pins to the right view points, etc.
In identifying the images, and the reason for identifying them, I was able to come up with a number of Photos-specific search queries (including a few stupid ones) produced the following results:-
  • the query 'wife' actually produced 0 hits, and 'friend' only found images with the word in the title.

  • The 'name of the capital city' produced 100% perfect results, but the 'name of the county' was contaminated with one specific set of photographs taken in one specific UK city. There was one specific issue concerning this capital city. As with many large cities there are places that identify themselves differently from the city, but for one reason or another we associate with that city (or at least during a visit), e.g. Greenwich and Harrow in London, Versailles in Paris, or Potsdam in Berlin. Because the place address does not include the capital city, it does not appear in searches on London, Paris or Berlin, e.g. the address of the Palace of Versailles is Place d'Armes, Versailles, France. So my solution is to ensure that folders on Versailles (when needed) appear in an album with Paris in the title.

  • 'Cultural site' produced 0 hits.

  • 'Palace' produced a good set of hits, including the explicitly named palace in the capital city. It also included Château as a palace, and one castle looking building. But it also threw in a Spanish golf club and the hotel Caesars Palace in Las Vegas.

  • 'Park' only produced 11 hits, and excluded the explicitly named park in our capital city. For some reason it included a number of sites in La Vegas, a few photographs of Dubai, and a photograph of a 'square' at night.

  • 'River trip' produced 31 hits, including the 'trip on the river…) in the capital city. But it also included a few lakes (not all), and yet it only included one photograph of a river trip in Phuket, from a collection of many.

  • 'Parliament' and 'parliament building', both produced 0 hits. The parliament building in our European capital had its official name, but it did not include the word parliament.

  • Two photographs of the building in which I gave a presentation posed a problem. Nothing in the existing tags could be used to identify the idea of a presentation or meeting associated with work.

As a kind of ancillary theme, I also searched:-
  • 'Art' produced 1,403 hits, including a few oddities such as a cake, Christmas decorations, etc.

  • 'Museum' produced 1,452 hits, including many items inside museums. It also included a sub-set of castle sites without an explicit reference to museums, yet it picked up the Getty Center in LA as a museum.

  • 'Painting' produced 597 hits, including a fair number of images that were not paintings, i.e. people, painted plates, chapels in churches, postcards, and even some humidity marks on a cellar wall (because it was 'repainted').

  • 'Sculpture' produced 363 hits, and appeared very successful, except for including a dance video.

  • 'Architecture' produced 0 hits, whereas 'building' produced a very credible 823 hits, 'château' 360 hits, castle 196 hits, etc.

  • 'Hotel' produced 184 hits, all hotels in one form or another.

So, in addition to the obvious examples 'Mum & Dad', 'Sister's family', etc., I decided to add:-
  • 'Art', a topic I'm passionate about.

  • 'Architecture', possible the topic I'm most interested in.

  • Hotels, which I occasionally photographed, without an explicit reason.

  • 'Work meetings', involving places/events that I photographed because of work.

  • 'Passport' for photographs for official documents, etc.

One question
concerns the need to sub-divided 'art' into 'paintings', 'sculpture', etc., and 'architecture' into 'château', 'castle', 'fortress', 'house', etc.

One additional topic that appeared in this first test set of 21 images was
the problem of language. Many objects, sites, sights, buildings, etc. have titles in the language of the country, as well as a translation in to English, e.g. castle, château, castello, schloss, castillo, etc. come to mind. And in addition some words have potentially several alternative translations, e.g. château can be anything from a large country house to a castle, and castillo can also be a fortress, burg, palace, etc.
What I try to do is included somewhere in the 'Info' pane both
the official local language title and the English translation, e.g. Schloss Charlottenburg and ⁨Charlottenburg Palace.

The collection of user defined keywords is found under View>Show>Keyword Manager

Edited badge
Photo has been edited.
Keywords badge
Photo has had keywords applied.
Location badge
Photo’s location has been identified on a map.
Favourite badge
Photo has been marked as a favourite.
Video clip badge
Item is a video, slo-mo or time-lapse clip.
Referenced file badge
Original photo is stored in another location (not in the Photos library on your Mac).
HDR badge
Original photo was taken as a High Dynamic Range (HDR) photo that combines three photos taken at different exposures.
RAW badge

JPEG + RAW badge
Original photo was taken as a RAW photo. The badge appears as JPEG + RAW when the photo was taken as a RAW photo that includes a JPEG version.
Live Photo badge
Item is a Live Photo.
Live Photo Bounce badge
Item is a Live Photo set to Bounce.
Live Photo Loop badge
Item is a Live Photo set to Loop.
Long Exposure badge
Item is a Live Photo set to Long Exposure.
Portrait badge
Item is a portrait photo.

PS - in this search for the Photos keyword library I came across
SF Symbols 3.2, an iconography library of 3,300 symbols that integrate seamlessly with Apple's system font (check out their use as part of the Apples Human Interface Guidelines). Apple also provides Design Resources for rapidly designing apps.

Location 'Info'

Location info can be one of the most powerful features in Apple Photos, but it is also one of the most irritating.

The first thing you can do is to
see where a photo was taken using Preview on Mac. Just how useful is this? It tells you to open a photo, whereas all my photographs are inside Apple Photos. However, we are also told how to import images from a camera into Preview on Mac, but here you have to connect a camera (or device) to the Mac. You can also scan a document or image in Preview on Mac, by connecting it to a scanner.

But you can export an image from Photos, including with or without the title, keywords and caption, and separately the location information. Now you can open the image in
Preview and look at Tools>Show Location Info (see below). Apple has a Preview User Guide but it does not describe in detail the contents of the 'image inspector panes'.

Image Inspector General Info File

The first inspector pane is the 'General Info' on the image, the date here is the date I copied the original image from Photos.

Image Inspector General

The 'General' inspector pane in 'More Info' mentions information already found in the 'General Info' pane. In addition there is mention of a 'Depth' of 8. Firstly the RGB colour model is an additive colour model where the bridges of red, green and blue are added together to reproduce a broad array of colours. The depth is the number of bits used for each colour component of a single pixel. So as far as I know it defines the precision with which each primary colour can be coded, and thus defines the gamut, or subset of colours, that can be expressed.

Image Inspector Exif

The Exif pane describes the exchangeable image file format, which covers the format of the image and a collection of tags added by the digital camera, e.g. the camera manufacturer, the colour space, resolution, compression, etc. Here we can see the original date when the image was captured (and not when it was copied).

Image Inspector GPS

The GPS pane shows what is in a separate image file directory which included the coordinates where the image was taken. There are EXIF tags which store the latitude and longitude of the place where the image was taken, i.e. the 'geotag'. There is also a tag which stores the direction the camera was pointing.

The image direction is the direction the camera was pointing, with North 0° and moving clockwise, so 300° is near NorthWest by West (as per a compass, i.e. magnetic north). 'Destination bearing' is going to be the same as 'Image direction' if you are just standing, pointing the camera and taking a picture.

We can see that the coordinated are 36° 20' 46.372" N - 6° 10' 2.742" W. These are in degrees, minutes, seconds, but often would be expressed slightly differently in navigation equipment (usually degrees and decimal minutes). You can also find coordinates expressed as something like +32.306042, -122.61458, which are decimal degrees of the format ddd.ddddd° with the first '+' meaning north of the equator and the '-' meaning west longitude.

We can also see a small map with a pin showing the location. What 'Show in Maps' does is to open Maps and displays in more detail the location where the photograph was taken.


Image Inspector IPTC

Image Inspector TIFF

Using Apple Photos across different devices

I want to have access to my photos on all my devices, MacBook Pro, iPad's, and iPhones. With my recent purchases I've always gone for the largest storage capacity possible.

So this means I use
iCloud to store all of my photos, with their original resolution and metadata.

iCloud Photos

And this means is that I've selected 'iCloud Photos' under iCloud Preferences in Apple Photos, which automatically uploads and stores all my photos and videos in iCloud. I've also selected 'Download Originals to the Mac', which means that my MacBook Pro also keeps my entire full-resolution library.
So when I take a photo with my iPhone it is automatically loaded up into the packaged file 'Photos Library.photolibrary' in the 'Pictures' folder on my MacBook Pro, as well as being loaded into my iCloud Photos. There is a 'Photos User Guide' which tells us that the 'photolibrary' is the only library that can access iCloud and Time Machine (see Back up the library in Photos on Mac). You can look inside the packaged file 'photolibrary' but there are plenty of warnings concerning trying to play with its contents. A right-click on 'photolibrary' will offer a variety of options. With 'Show Package Contents' you will see five subfolders, and all the photos and videos are listed in more subfolders by year, month and day in the 'Masters' folder.


iCloud Photos not only automatically synchronises photos across all my different devices, but it also does the same for any edits made to photos on any device (including also any deletes).

Creating an Album

So first all, photos arrive in a folder called 'Photos' in the Photos Library. And one of the first things people might want to create is an 'Album', which is a way to pull together a coherent collection of photos and video clips. This could be about a particular theme (e.g. golf), or a particular period (e.g. holiday in Spain 2017), or just a particular day (e.g. 4 July 2016).

There are a number of different ways to create an 'Album':-
The first way is to go to File>New Album, which will open an empty 'Untitled Album' in the 'My Albums' folder under 'Albums'. You can then name (or rename) the folder, for example 'golf'. You can then drag individual or collections of photos and videos, and drop them in the selected folder.
Another way is to have selected one or more photos and videos and then go to File>New Album with Selection (xx Photos). This will create the same 'Untitled Album', and will at the same time place links in that album to the selected photos and videos in the 'Masters' folder in your
'photolibrary'. You can then name (or rename) the folder.
A third way is to select one or more photos and videos (so-called 'multiple selection') and simply drag them to 'My Albums', and a populated 'Untitled Album' will be created automatically. You can then name (or rename) the folder.

You can drag and reposition the created folder anywhere in the collection of folders created under 'My Albums'. A right-click on any folder offers an additional set of options, including the possibility to delete folders.

It's important to note that creating albums does not involve creating duplicates of the photos, what is created is an album with a set of logical links to the original photos stored in the Photos Library.

What is a 'Smart Album'

There is an alternative way to create an album, that is to use the '
New Smart Album' feature under 'File'.

Smart Album

This feature looks very much like the 'Smart Folder' feature in 'Finder', in that it gathers together and display photos that meet a very elaborate set of criteria.

Smart Album 2

Above we have a 'Smart Album' created from photos taken on a specific day and including 'birthday' in the description. Just as with 'Smart Folder', Photos will add automatically any new photos that match the criteria and remove photos that no longer match them.

Q&A on using Photos

This Q&A session has been built by just working through set after set of images, and trying to understand what is possible and what is not.

Question - Looking at one image, I saw two recognised faces, and one 'unnamed' with a circle around the face. I didn't want that circle and 'unnamed' box.
Answer - You cannot remove individually 'unnamed' faces. The face detection cannot be disabled, and we are no longer allowed to reject automatically detected faces since Photos 2.0 on macOS 10.12.4. On the other hand there is no longer an unmanageably large unnamed faces collection. You can only Show/Hide Face Names for all names on all images.