Re: A color space puzzle
Re: A color space puzzle
- Subject: Re: A color space puzzle
- From: Rolf Gierling <email@hidden>
- Date: Fri, 08 Feb 2002 15:19:03 +0100
"Bruce J. Lindbloom" wrote:
>
I'm not sure I agree with your answer, though. The correlation between the
>
green channel and the Y ("kind of green" which is also the luminance) does
>
not have a bearing on the solution. The same behavior holds equally true for
>
any channel.
>
>
For example, if you started with a copy of sRGB and moved only the blue
>
primary to make a new working space, then converting an image from sRGB to
>
the new working space would preserve the blue channel data and change the
>
only red and green.
Thats exactly the goal.
If you first compute the XYZ values out of the primaries given
and then set up the matrix that converts XYZ values to RGB values,
you will find that the green channel is independent of green primaries.
The same ist true for the red channel and the blue channel.
But as I wrote, my answer was very simplified.
To exercise this puzzle by my Maple spreadsheet took me about ten pages
of formulas.
Rolf Gierling
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