Click the green flag. Then play with the sliders, or click the randomize button. Click the image to change it to another image.
The colorization is achieved by stamping semi-transparent versions of the image with color effects applied to them. "Stamps" Is the number of semi-transparent stamps (of increasing transparency) are used. "Color change" is how much the color is changed between each stamp. 100 is the complementary (opposite) color. Note that color change values around 100 produce near-grayscale* effects, and the more stamps you use, the larger the span that produce this effect grows. * The sky of the cartoon town clearly shows that it isn't fully desaturated. I borrowed code and was inspired by the following projects: Image decolorization methods by @Kouzeru: https://scratch.mit.edu/projects/498658206/ How to display a sprite in black & white by @gtoal: https://scratch.mit.edu/projects/116458484 Add Your Face by @Brontosplachna: https://scratch.mit.edu/projects/89354871
