This version should do better (update: made more idiomatic/terse, it should really do aspect preservation to make a better image instead of translating an unknown aspect to a square)–
use strictures;
use GD;
use Path::Tiny;
GD::Image->trueColor(1);
my $original_image = GD::Image->new( shift || die "Give an image!\n" )
+;
my $new_image = GD::Image->new(100, 100);
$new_image->copyResampled( $original_image,
0, 0, 0, 0,
$new_image->getBounds,
$original_image->getBounds );
path("new.jpg")->spew_raw($new_image->jpeg);
The changes that make it “right” are GD::Image->trueColor(1) and $newimage->copyResampled instead of copyResized.
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