Xpra: Ticket #1155: synchronize client colourspace / calibration

This may impact #1107 (containers can specify the colourspace used for rendering), #41 (not sure how to handle this one..)

We want to capture the colour profile that the client will use for rendering our pixels on screen(s) and expose it to the server so applications will use it, and / or ensure we use this profile when encoding the pixels.

Links:

chromium: Support color management transform of ICC profile tagged images to device profile on Linux
OpenIcc
sampleicc
Wikipedia: ICC profile
Colour Wiki:
ICC Profiles in X Specification
Arch wiki: ICC Profiles
ICC Profiles and Monitor Settings Database
ICC Profile Taxi: icc profile search engine
dispwin: install or uninstall a profile in the system for the chosen display
xicc
Where display profiles are stored, and how to load them automatically (for all platforms)
Little CMS: Little CMS intends to be an OPEN SOURCE small-footprint color management engine, with special focus on accuracy and performance
Pillow: imagingcms: support for lcms / win32 API in Pillow.
ICC profile transformation using PIL

MS Windows specific info:

WCS: Windows Color System
Introduction to Color Management in Microsoft Windows Operating Systems
MS Windows Profile Management Functions
WcsGetDefaultColorProfile: Retrieves the default color profile for a device, or for a device-independent default if the device is not specified.
GetColorSpace: The GetColorSpace? function retrieves the handle to the input color space from a specified device context
GetICMProfile function: The GetICMProfile function retrieves the file name of the current output color profile for a specified device context
GetLogColorSpace: The EnumICMProfiles function enumerates the different output color profiles that the system supports for a given device context
Using ICC profiles in Windows (GUI screenshots)
Color Management: Monitor profile changed notification for Windows?

OSX:

windowDidChangeBackingProperties: The notification NSWindowDidChangeBackingPropertiesNotification is posted on OS X v10.7.3 or later when a window’s backing scale factor or its color space changes
NSScreenColorSpaceDidChangeNotification example seems to require 10.6 or later..
Handle Dynamic Changes in Window Resolution Only When You Must: Listening for NSWindowDidChangeBackingPropertiesNotification is something only a few apps—primarily those apps that specialize in video or graphics work, and for which color matching and high-quality rendering fidelity are especially important—will need to do
NSColorSpace

As per the arch wiki, a number of apps already use the icc profile: firefox, eog, gimp, mpv, ..

Here's how I set my icc profile:

xcalib ~/.Seiki_pro_SM40UNP_user.icm

Wed, 30 Mar 2016 07:30:13 GMT - Antoine Martin: status, description changed

status changed from new to assigned
description modified (diff)

r12282 + r12292 adds basic ICC information for win32 collected using pillow which calls GetICMProfile - we could pass it an HDC for each monitor to get per-monitor information, but this would need to go with changes to ensure that the monitor indexes used for reporting the geometry are the ones used for icc (GTK messes with things and may re-order monitors...)
r12284 does the same for OSX, where we get per-monitor values too (same monitor-order caveat applies) - here, we do get the raw ICC data in a blob already, so this can easily be applied server-side
for Linux, I think we need to make sure python-pillow is built with lcms support - and even then, I don't get any values out.. but I do get lots of data using colormgr get-devices

Sun, 10 Apr 2016 06:33:06 GMT - Antoine Martin: milestone changed

milestone changed from 0.17 to 0.18

re-scheduling

Thu, 16 Jun 2016 03:11:55 GMT - Antoine Martin:

For printing colour accuracy, see: Ghostscript Color Management.

Wed, 22 Jun 2016 08:15:51 GMT - Antoine Martin:

opengl: ARB_framebuffer_sRGB.

Tue, 12 Jul 2016 16:52:22 GMT - Antoine Martin: milestone changed

milestone changed from 0.18 to 1.0

Milestone renamed

Wed, 10 Aug 2016 04:25:55 GMT - Antoine Martin: owner, status changed

owner changed from Antoine Martin to alas
status changed from assigned to new

Time to collect some data, at least on OSX and win32.

Then we can decide what to do with it.

Lots of work done on this: OSX clients colourspace detection, ICC profile export to the session - ticket:1086#comment:4

Fri, 14 Jul 2017 16:08:00 GMT - Antoine Martin: owner, status, milestone changed

owner changed from alas to Antoine Martin
status changed from new to assigned
milestone changed from 1.0 to 2.2

1 year without data, time to do it myself.

Thu, 10 Aug 2017 16:13:29 GMT - Antoine Martin: milestone changed

milestone changed from 2.2 to 3.0

I don't have the hardware required for testing this, re-scheduling.

Some good links:

Sat, 24 Feb 2018 16:56:39 GMT - Antoine Martin:

I'm not alone in thinking that colour management on Linux is a mess: Open Source Color Management is broken

Wed, 28 Mar 2018 05:17:36 GMT - Antoine Martin: milestone changed

milestone changed from 3.0 to 3.1

Wed, 20 Mar 2019 01:50:30 GMT - Antoine Martin:

Wed, 20 Mar 2019 05:06:15 GMT - Antoine Martin: milestone changed

milestone changed from 3.1 to 4.0

Milestone renamed

Wed, 12 Feb 2020 16:01:25 GMT - Antoine Martin: milestone changed

milestone changed from 4.0 to 4.1

Sun, 04 Oct 2020 12:57:30 GMT - Antoine Martin: milestone changed

milestone changed from 4.1 to 4.2

Sat, 23 Jan 2021 05:16:29 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1155