P3 color space and CS5

I have a question myself. P3 is the display color space for the ipad pro 12.9(2018). Here is what one reddit poster added:

"The vast majority of content on the internet is saved out in sRGB including everything on Facebook, instagram, YouTube, etc. So it will make no difference in those cases.

It will really only be noticeable if you shoot and edit your own RAW photos since they haven't been squeezed down to sRGB yet. I am not sure how the Camera app handles shooting regular JPEG photos but I would imagine on P3 iDevices it saves them with a wide gamut profile. So your own photos or friends' photos will probably look better too. But when they get saved and shared on most social media sites the extra color information is generally lost."

So I guess P3 makes sense if you use an ipad for conversion from raw photos?

Hi,

Photoshop uses working colour spaces to provide visually referenced meaning to the RGB numbers in a file. We call those working spaces device independent colour spaces. i.e they are not related to a specific hardware device like a display, projector, camera, scanner or printer.

Without a defined colourspace the RGB numbers are meaningless*. So when saving or a passing on files, an embedded ICC profile is very important.  The colourspace of a file is defined by an embedded ICC profile [sometimes called a "tag"].

(*same applies to CMYK numbers)

you can read up about ICC profiles here https://www.colourmanagement.net/advice/about-icc-colour-profiles/

so - to your question

IF,

when saving, Photoshop's "embed ICC profile" is checked in the save dialog, then the relevant document profile will be saved as a "tag" with the file. 

IF

you are working on a file in the "p3" colourspace then that ICC profile would be embedded. 

Most likely, though, you'll be working on images in one of 2 widely accepted colour spaces sRGB or Adobe RGB. IN most cases its likely safest to send out files in one of those 2 colourspaces. I can't think of a "normal" scenario where using Apple's recently adopted monitor colourspace [p3] would be relevant or useful. 

The profile would have to be assigned to the document, and you would have to check Embed Color Profile in the Save dialog when you save.

If the profile is set as the RGB Working Space in Color Settings, and the RGB Policy is not set to Off when you create a new document, it would automatically be assigned. Otherwise you would have to use Edit>Assign Profile or Convert to Profile.

Images opened via Camera RAW get the profile chesen in Workflow Options as the assignment.

I don't think DCI-P3 was invented when CS5 was released - but anyway: if you have that profile installed, you can create your files in the DCI-P3 color space if you wish. That profile follows the file throughout, and when you save the file, Photoshop should automatically embed it.

I'd be a little careful, though. DCI-P3 is still not widely implemented or widely used, and unless you know the file will be handled in a fully color managed process further on, it's a bit risky. It is still mainly a generic display profile for Apple machines (more or less exclusively). It's not yet fully regarded as one of the standard color spaces beside sRGB, Adobe RGB and ProPhoto. But it probably will be in time.

DCI-P3 is originally a digital cinema projector standard, until Apple adopted it for their iMac and later MBP displays. For some reason they didn't want to use the already existing wide gamut displays, which have pretty equivalent characteristics.