|This image represents the standard RGB color cube. All three colors are equally weighted.
||This image represents the Luminescence RGB color cube. The colors are weighted according to their perceived brightness
Hal Glicksman, an instructor in computer art at California State
University, Long Beach, inspired me to continue work on color systems. He
has an interesting page White is
Green. His charts on color space provided me with the visual goal
for a color-space. Using ImageFX's Convert-To-Grey with Luma weighting (Red
30%, Green 59%, Blue 11%) yielded a perfectly smooth grey transition.
More research on the web lead me to Christopher Yang's Master Thesis.
His formula for conversion from a color-space called LHS to RGB formed
the starting point for my own code. If you're interested in the
mathematical underpinnings of color theory his pages are worth reading.
The images below were generated by stamping the bottom color brush down on the
grey ramp on the side. I used my CColorize draw mode set to
seven different color spaces.
True Color Spaces
These color spaces are the same code using
color weightings based on testing from different organizations.
Artificial Color Spaces
|Color Space ||Red ||Green||Blue |
|ITU ||22.2%||70.7%|| 7.1%|
|Rec 709 (ITU)||21.3%||71.5%|| 7.2%|
|SMPTE ||21.2%||70.1%|| 8.7%|
- HLS colorizing works o.k. It's handy for larger hue shifts. Some
damage is done to the image brightness.
- HSV colorizing process resulted in a dark and muddy image, it was
included for completeness.
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