Visibility against an unknown background

Ben Finney bignose+hates-spam at
Wed Oct 25 01:36:51 CEST 2006

Grant Edwards <grante at> writes:

> The traditional way to draw lines on something with varying colors
> is to use the "xor" operator when drawing the lines.

But first, negotiate a patent license for this highly innovative and
non-obvious technique that is "owned" as US Patent #4,197,590.


Aren't monopolies on ideas wonderful?

 \     "I'd like to see a nude opera, because when they hit those high |
  `\   notes, I bet you can really see it in those genitals."  -- Jack |
_o__)                                                           Handey |
Ben Finney

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