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#!/usr/bin/perl | |
use strict; | |
use warnings; | |
use GD; | |
my $filename1 = shift or die "usage: xorimg ONE.PNG TWO.PNG > OUTPUT.PNG\n"; | |
my $filename2 = shift or die "usage: xorimg ONE.PNG TWO.PNG > OUTPUT.PNG\n"; | |
my $one = GD::Image->newFromPng($filename1, 1); | |
my $two = GD::Image->newFromPng($filename2, 1); | |
my ($w, $h) = $one->getBounds; | |
my $out = GD::Image->new($w, $h, 1); | |
for my $y (0 .. $h-1) { | |
for my $x (0 .. $w-1) { | |
my ($r1,$g1,$b1) = $one->rgb($one->getPixel($x, $y)); | |
my ($r2,$g2,$b2) = $two->rgb($two->getPixel($x, $y)); | |
put($out, $x, $y, ($r1^$r2), ($g1^$g2), ($b1^$b2)); | |
} | |
} | |
print $out->png; | |
sub put { | |
my ($img, $x, $y, $r, $g, $b) = @_; | |
my $col = $img->colorAllocate($r,$g,$b); | |
$img->setPixel($x,$y,$col); | |
} |
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