Imager is pretty good for that. For an example of manipulation see Tk ImageMap-color-zones. That just tints images. To replace some color, you could go thru every pixel, test for the rgb value to change, then adjust each pixel. I don't see anyway other than going thru the image pixel by pixel. Tinting is fast. Testing each pixel is slow.
Here is a snippet to get pixel rgb values with GD, and I'm sure Imager has a similar method.
#!/usr/bin/perl
use GD;
my $image = newFromPng GD::Image('z.png');
($x,$y)=$image->getBounds();
$maxColors = $image->colorsTotal;
$pixel=$image->getPixel(23,34);
($r,$g,$b)=$image->rgb($pixel);
print "$r\t$g\t$b\n";
And check out gif colour changes
I'm not really a human, but I play one on earth.
flash japh
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