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Blocks By Hue and Brightness
and associated edge detect
Description
Blocks by Hue and Brightness Where there is a perceptual hue difference between adjoining pixels – a perceptual difference is one where the colour name is different – or a brightness difference greater than the one specified, the output places an opaque pixel and, by option, continues this horizontally and/or vertically at a colour that is the mdian, most or lest saturated or light of those affected before another change takes place.
The effect is to produce a form of edge detection, without the fill-ins, or a set of colour blocks based on edge etection with the fill-ins.
or alternatively image url apply
  – see copyright notice
-% done - patience! large files can take a while. 
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Formula for calculating brightness:
Include hue difference
Brightness difference
min. pixels in a block
no fill
fill horizontal
fill vertical
fill both
Paint Result
Saturation per row block:
Highest
Median
Lowest
Lightness per row block:
Highest
Median
Lowest