* Paolo Pedaletti <paolo.pedaletti@unimib.it> [2005-08-26 11:37]: > may be someone here knows if exist a tool (imagemagick?) that can count > how mutch black or white exist in a photo/image The problem is: I have > a photo with spots with different size. I want to know how much this > spost fill the photo surface (in %) and I want to do it via script (no > human interaction, if possible) Do you know something usefull? Try the simple-minded Perl script attached below. Run it like this (you will need the libgd-gd2-perl package): $ ./color-count.pl test.png [255, 0, 0]: 458 [129, 92, 35]: 140 [255,255,255]: 1467 [129,188,131]: 435 The output format is [red,blue,green]: pixel-count. Only works with PNG files, but you can transform your GIF file using the convert command from ImageMagick. Hope this helps. -- Rafael
#!/usr/bin/perl -w
use GD;
die "Usage: $0 file.png\n" if $#ARGV != 0;
die "Cannot open file $ARGV[0]" if not -r $ARGV[0];
$image = GD::Image->newFromPng($ARGV[0], 1);
($width, $height) = $image->getBounds();
%count = ();
for $i (0 .. $width - 1) {
for $j (0 .. $height - 1) {
$count {$image->getPixel ($i, $j)} ++;
}
}
for $k (keys %count) {
($red, $green, $blue) = $image->rgb ($k);
printf ("[%3d,%3d,%3d]: %5d\n", $red, $green, $blue, $count {$k});
}
Attachment:
test.png
Description: PNG image
