Re: ColorMunki Online video demos
Re: ColorMunki Online video demos
- Subject: Re: ColorMunki Online video demos
- From: Marco Ugolini <email@hidden>
- Date: Mon, 22 Dec 2008 00:30:54 -0800
- Thread-topic: ColorMunki Online video demos
In a message dated 12/20/08 3:57 PM, Klaus Karcher wrote:
> Roger Breton wrote:
>> http://colormunki.com/colorknowledge/training?type=photo.
>>
>> I thought it was well done and simple to understand.
>
> Indeed it is. However there is one statement in the video that bothers
> me: "color is greatly influenced by the colors around it. Well, that's
> not exactly true. Actually our perception is greatly influenced by the
> colors around whatever we are looking at."
>
> Color *is* our perception by definition (and not the physical stimulus).
> In this respect, the statement "color is greatly influenced by the
> colors around it" /is/ exactly true IMHO.
Klaus,
Other things strike me as overly simplified too:
- The statement that the human eye perceives three primary colors of light,
red, green and blue. Actually, the three color matching functions in the
Standard Observer are "red", "green" and "blue" only in the widest sense of
the terms. Rather than clearly separate and distinct "primaries", they are
instead largely overlapping spectral responses inside the eye's cones which
are then recombined in the brain to create the composite sensation of color.
- The statement that Red is the opposite of Cyan, Green of Magenta and Blue
of Yellow. True in a very abstract sense, but misleading without also saying
that they are *far from perfect* opposites. Due to the very different
natures of additive RGB emissive signals vs. subtractive CMY reflectivities,
the latter call for the addition of K to increase the otherwise weaker
dynamic range that a combination of CMY alone is normally unable to produce.
Whereas there is no need of a fourth primary in RGB, which achieves
theoretically perfect maximum "density" (black) at R 0, G 0, B 0.
But, though objectionable, such oversimplifications are understandable in
light of what these videos are probably meant to do, which is to appear
friendly and inviting, and not scare the viewer with concepts that may
appear too complex and off-putting -- so that possible customers will feel
encouraged to step into the arena of color management, instead of retreating
in horror.
Marco Ugolini
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