one fing leads . . .

Edge Detect by Brightness Level
or image url apply
  – see copyright notice
......
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Brightness Breaks
canvas pointer
H: °
S: %
V: %
R:
G:
B:
Web Hex:
line colour
background colour
background transparent on fullsize
No of pixels per line (fullsize only)
Formula for calculating brightness:
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more experiments for the sake of my dreams