Re: color border in image, drop everything outside of it

[Emanuel Berg <moasenwood@zoho.eu>]

Michael uplawski wrote:

> That is a mystery which noone ever could resolve. There is
> pratically no experience with this tool and no hints have ever
> been published. I think the whole thing is utterly useless and
> that it has never made any sense to publish this stuff anyway.

It idea is super-easy, there are three types of colors. it is drop
(d, any color that isn't stop), stop (onee color), and keep (any
color). Drop is outside, keep is inside, stop is ... stop.

So this 

  ddddddddd
  dddsssddd
  ddskkksdd
  ddsssssdd
  ddddssddd

will turn into this

  .........
  ...sss...
  ..skkks..
  ..sssss..
  ....ss...

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