sRGB, ProPhoto RGB and More—Do You Know Your Color Spaces?
Summary
There is a wide range of possible causes for this, and not all of them can be resolved, but some can, so it pays to know the foundations of how different devices work with colors. The details need not interest us, but still: the Z component determines brightness, and so if it is left out (and the other coordinates are recalculated a bit into lower-case x and y), we get a 2D space in which one can indicate every shade of color. Unfortunately monitors still vary individually, but manufacturers at least know what standard they should try to approach, and so deviations are perhaps smaller than in the past. JPEG images are generally only delivered sRGB colors, even though on certain cameras you can also choose to save to Adobe RGB via a menu option. If you were to publish an image in a different color space, you still can’t be certain even today that it will be displayed to other people in their browsers correctly at all.
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