Cellular automata / gradient filter

[yaitskov]

Hi,

I think I hit the limit of parametric and drawn filters while working on a photo with long black hair dyed in blond overlapping with body skin and black rock as background. I wanted to recolor (shift hue) of hair and body into separate colors and don't touch background.

After scratching my head I came up with following filters.

A gradient parametric filter gets an initial point color or range to start with plus another set of sliders for every channel (hue, chroma, etc), but these sliders describe relative difference between adjacent pixels (gradient) instead of absolute values.

Cellular automata filter: list of rules for neighbor pixels deciding whether the pixel is covered by filter.

The filter rule is:

• a tuple of parametric filter or gradient one, and min/max number of pixels at the distance from current point, satisfying the filter.
• AND/OR/NOT/XOR expression with filter rules as operands

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