Of Pats and Palettes, and Peaks

Ninth in a series of blog entries about color theory with live help from the ColorTheory (Step 9) .  First_post,  Prev_post, Next_post

This post will be a bit more dull, because we’re going to spend it introducing a new panel in the Color Theory application. Or, if you actually enjoy playuing with the application, it may make the application a little more interesting.

We’re adding the “Palette” panel, to allow us to stash and manipulate little pats of color.

palette, label, x, y, clr, note, ...
opponent, palette1pat1, 226, 331, #8000ff, "Peak Red 2", ...
opponent, palette1pat2, 226, 295, #7700ff, "Peak Blue", ...
opponent, palette1pat3, 226, 259, #00b3ff, "Unique Blue", ...
opponent, palette1pat4, 226, 223, #00ffbb, "Unique Green", ...
opponent, palette1pat5, 131, 201, #00ff95, "Peak Green", ...
opponent, palette1pat6, 131, 165, #00ff59, "Peak Yellow", ...
opponent, palette1pat7, 131, 129, #2bff00, "Peak Achromatic", ...
opponent, palette1pat8, 37, 106, #ffdd00, "Unique Yellow", ...
opponent, palette1pat9, 37, 70, #ff1500, "Peak Red 1", ...
opponent, palette1pat10, 37, 34, #ff0040, "Unique Red", ...

What is interesting about that palette? In a previous post Hurvich and Jameson research on the opponent processes. But if we look at the Hurvich-Jameson resonse data in the figure, we can see several other colors of possible interest besides the unique colors, and these are shown in the palette above.

Hurvich-Jameson Opponent Reponses

Going from right to left, we start with Unique Red, where the blue-yellow response is zero; the Peak Red response (peak 1, since there is a second peak red on the other side); Unique Yellow where the red-green response is zero; Peak Achromatic (e.g. the lightest color in a monochrome sense); Peak Yellow response; Peak Green reponse; Unique Green where the blue-yellow response is zero; Unique Blue where the red-green response is zero; the Peak Blue response; and finally the secondary Peak Red #2 response. Note that the opponent responses aren’t that independent from each other- Peak Blue and Peak Red#2 are so close we may as well call it Peak Purple.

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