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[Chicken-users] color egg
From: |
John J Foerch |
Subject: |
[Chicken-users] color egg |
Date: |
Mon, 29 Aug 2016 23:21:14 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Hello,
Has anybody used the color egg to do colorspace conversions? I'm
getting some unexpected results, and wonder whether there are bugs in
the egg, or whether I just misunderstand something about the colorspaces
involved.
Here are the relevant links:
http://wiki.call-cc.org/eggref/4/color
http://people.csail.mit.edu/jaffer/slib/Color.html
This call gives the result I expect:
(color->sRGB (color:RGB709 1 0 0))
=> (255 0 0)
This one does not:
(color->e-sRGB 16 (color:RGB709 1 0 0))
=> (57216 24576 24576)
I would expect a result of (65535 0 0)
This result also puzzles me:
(color->L*C*h (color:RGB709 1 0 0))
=> (53.2405879437449 104.552006845446 39.997712561153)
I haven't worked with the L*C*h colorspace before, but from my reading,
since I gave pure red to convert, I would have expected a hue angle of
0, a chroma of 100% and a luminosity of something like 50%.
Unfortunately the egg has no unit tests, and I think that if some could
be written, that would be very helpful.
Is there anybody familiar with the color egg who can show me where
either it or I am going wrong?
Thank you,
--
John Foerch
- [Chicken-users] color egg,
John J Foerch <=