Color Management and Targeting Outputs

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21

Chrome has no way of setting a monitor color profile, so it’s not color managed. Supporting only an image profile but no monitor profile is like making bread with all the flour but no water…

22

The solution - using an sRGB (RT_sRGB) output profile - is the best option for both of these cases. They are the same thing. The person with the sRGB calibration and profiling deviates from sRGB as little as their colorimeter, software and hardware allow, while the person without the sRGB calibration and profiling deviates more, because their monitor are made to work with sRGB, kinda, but accurately calibrating and profiling it wasn’t included in the price.

http://rawpedia.rawtherapee.com/Color_Management#Output_Profile
http://rawpedia.rawtherapee.com/Color_Management_addon#Shipped_files

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23

This may be, but I have to wonder - does the browser try to respect or do something with the image profile? It would explain what I am seeing with images that contain a profile at least.

24

Hi @patdavid,

Even if Firefox has the ability to color manage images, color management is by default off and the users have to perform some wizardry using about:config (if ever they dare to go past the initial warning messages).

Some tests:
http://cameratico.com/tools/web-browser-color-management-test/

And some relatively modern info:
http://www.color-management-guide.com/web-browser-color-management.html

25

Yes, and in fact pmjdebruijn made mention of the same in irc yesterday (along with instructions on setting it pretty quickly - i’ll bug him again and post it here). This is quite frustrating… but then I’m “preaching to the choir” as it were…

26

There are actually add-ons which make it easy for a layman to enable color management and choose a display profile for Firefox. I am using one called “Color Management” :slight_smile: My eyeball says, that it seems to work properly.

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https://addons.mozilla.org/en-US/firefox/addon/color-management/

28

From Pascal on IRC:

$ sudo sh -c 'echo "pref(\"gfx.color_management.rendering_intent\", 0);" >> /etc/firefox/syspref.js'
$ sudo sh -c 'echo "pref(\"gfx.color_management.mode\", 1);" >> /etc/firefox/syspref.js'
$ sudo sh -c 'echo "pref(\"gfx.color_management.enablev4\", true);" >> /etc/firefox/syspref.js'

Will also set Firefox to a sane color-management.

For reference:

  • gfx.color_management.mode
    Integer values.

    • 0 - disable
    • 1 - enabled for rendered graphics
    • 2 - enabled for tagged graphics only (default)

  • gfx.color_management_rendering_intent
    Integer values.

    • -1 - Honor the intent in the image file
    • 0 - Perceptual (default)
    • 1 - Relative Colorimetric
    • 2 - Saturation
    • 3 - Absolute Colorimetric

  • gfx.color_management.enablev4
    Boolean (true to enable ICCv4)

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