I suggest you put some debugging info into to the resizes, and see where it fails. Here is a simple script that shows how to see if the resize fails. It's a peculiar way of doing it, but it works that way for IM.
Also, see the undef@$image line, which clears out the ImageMagick object's buffers, when run thru loops.
#!/usr/bin/perl
use warnings;
use strict;
use Image::Magick;
use File::Basename;
my $image = Image::Magick->new;
umask 0022;
my @pics= <pics/*.jpg pics/*.gif pics/*.png>;
my @exts = qw(.jpg .gif .png);
foreach my $pic (@pics){
my ($basename,$path,$suffix) = fileparse($pic,@exts);
my $ok;
$ok = $image->Read($pic) and warn ($ok);
rename ($pic, "$pic.bak") or warn $!;
my $resize = "$basename.jpg";
$image->Scale(geometry => '500x500');
$ok = $image->Write("pics/$resize") and warn ($ok);
undef @$image; #needed if $image is created outside loop
print "$pic ->resize to pics/$resize\n";
}
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