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Gregg Kreutz is the author.
Ok, I am tossing around ideas....
Let's say you have really dark purplish/brownish grapes. Often in paintings you will see that there is this area, besides the highlight, that just seems to glow. The addition of very light value of red mixed with some yellow can give the illusion of luminosity and high chroma.
On green grapes adding an intense yellow does the trick.
What do you add to red? If you dull the surrounding areas with grey, would you add the purest orange?
On an orange goldfish, what do you add to the already high chroma orange to make it shimmer with a even higher chroma?
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