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Thank you for your reply :)

When "entering" a pixel by pressing E, the pixel "above", which the user entered through should assume the average of all the pixels below. I thought it would be interesting to have the 16x16 pixels in the lower level diverge from the color of the pixel above when first visited, but they'd still have to average to the original color.

I googled a bit more but couldn't find any solutions, existing libraries or algorithms i could implement.

Maybe I'll try again in a few years, I'll keep the site running in the meanwhile :)