>    "You don't specify perceived brightness anymore, but absolute brightness"
> is a rather radical change, and many people will get confused by it,
> especially since in most systems (at least those with a gamma of 2.2)
> raw pixel values map almost linearly to perceived brightness.

Just tell them to use the srgb keyword, as it uses the same colour space 
as the web, MS Office, Paint etc.  rgb should be reserved for use only 
when you need to specify the absolute physical brightness.  I can fully 
imagine that later on srgb will become more commonly used and then we'll 
have questions like "what is the rgb keyword for?".

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