[Gllug] Image cropping from a script

[Nix]

On 4 Jul 2007, tethys at gmail.com said:

> I need to be able to crop an image from within a script, such that the
> resulting image is the smallest possible rectangle containing pixels
> of a given foreground colour. Any ideas?

I haven't tried it, but it seems to me that you could put something
together using ppmmake (to make a trivial one-colour index), pamlookup
(to create an image with all pixels but your target converted to the
same colour), and then using it as a -borderfile to pnmcrop.

(I'd test it only I don't know a suitable colour value in any of my
images and am feeling too stupid to determine one.)

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 be able to wield metal.' --- Kenneth Eng's colourless green ideas sleep
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