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since November 19, 2022



"Are the rainbow colors continuous?"

Yes, they are, perceptually. But some colors are not continuous at the pixel level.

Copyright Akiyoshi Kitaoka 2022 (November 19)

Web program to confirm that

Sample images



the original image


The transformed image with the highest chroma (Web program to transform



cf. Color illusion that veins appear to be bluish though the pixels are not





cf. How to make a color illusion image with additive color change

ワードで作る色の錯視教室・その1 (その2があるかどうかはわからない)

まずは、赤いものが写った写真を用意してください。 pic.twitter.com/fCLXQzxl4v

— Akiyoshi Kitaoka (@AkiyoshiKitaoka) April 30, 2020



cf. Web program to combine images addtitively

加算的色変換と乗算的色変換(additive color change and multiplicative one <November 10, 2022>



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