Ah, colour management. A nightmarish science.
In a nutshell, how a photo looks on the viewer's screen depends on
- the photographer's camera settings,
- the photographer's computer OS,
- the photographer's editing software settings,
- the photographer's graphics / video card,
- the photographer's monitor,
- the settings of the server where the photo is uploaded,
- the viewer's computer OS,
- the viewer's graphics / video card,
- the viewer's monitor,
- the viewer's browser
Any change in any of these parameters can lead to a different impression. It also means that, no matter how you treat your photo, different viewers may still get to see different results.
And this doesn't even touch the issue of calibration yet.
Now, if a photo looks different on the same computer, before and after uploading it, it narrows the issue down to server and browser settings.
As for the browser, Firefox gives this recommendation:
You could try adjusting Firefox's color management settings. This is an old write-up, but I haven't heard about any changes since then:
By default, Firefox will try to color manage tagged images (JPEGs and PNGs). You can review and experiment with the following preferences to see whether one of them is causing the problem:
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.
(2) In the search box above the list, type or paste gfx.c and pause while the list is filtered
gfx.color_management.mode - governs application of color management to images
0 = off
1 = on for ALL images
2 = on for TAGGED images (default)
I can't recall whether you need to quit/restart Firefox before this change, or changes to the below preferences, takes effect.
gfx.color_management.display_profile - if you have created a custom monitor profile and Firefox is not using it, you can enter the path to it here.
gfx.color_management.enablev4 - double-click to toggle to true if your custom monitor profile is an ICC v4 profile
gfx.color_management.rendering_intent - whether Firefox honors or overrides the intent flag in the ICC profile, by default, overrides to Perceptual
For details, see:
https://developer.mozilla.org/Firefox/R ... in_Firefox
Source:
https://support.mozilla.org/de/questions/1171999(Please note that this is a response to a user wondering why the same image shows different colour values in Firefox and Edge).
Another option to minimize potential problems for Photoshop users is by using the "Save for Web & Devices" funtion from the File menu. This will remove any embedded colour management information and save the image in strict sRGB mode (if that setting is selected, of course).
Now, there is still one instance in between that may change the colour impression of an image when it's uploaded, and that's how the image processing framework on our server interpretes the picture (ImageMagick or GraphicsMagick - I forgot which one our server actually uses).
And that's where this post ends. Because I honestly have no idea how we could tweak this. If anybody has any suggestions, please do let me know.
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