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LIJI, how did you manage to get rid of the red/turquoise effect?
(I'm using GIMP).
Also, is anyone having a crack at number 13? It seems similar to 10, but way more difficult.
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Basically the red channel was shifted — not sure about GIMP, but generally you should move the red channel while keeping the green and blue channels in place. Alternatively, you can simply omit the red channel altogether by creating a greyscale image with a (0; 50%; 50%) channel mix, since the image is pretty close to greyscale anyway.