in reply to Image::Magick Depth

According to a 2006 reply on video.image-magick.bugs, specifying depth attribute (with 8 as the value) should solve your problem. See also the manual (6.4x).

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Re^2: Image::Magick Depth
by Guildencrantz (Sexton) on Sep 03, 2008 at 04:20 UTC
    Unfortunately the Depth attribute is immutable. All references I've found suggest some kind of SetDepth function which does the changing. I just can't seem to find what it is.
[reply]
      DUH! Okay, I should have seen this before, but there's a Set() function: 
      $thumbnail->Set(depth => 8);

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      So, to ensure that my code performs as expected on both systems: 
      #!/usr/bin/perl

use Image::Magick;

my $thumbnail = Image::Magick->new;
$thumbnail->Read("full.bmp");
$thumbnail->Set(depth => 8);
$thumbnail->Write("full.png");

$thumbnail->Resize(width=>'200', height=>'150');
$thumbnail->Write("tn_200x150.png");

$thumbnail->Resize(width=>'100', height=>'75');
$thumbnail->Write("tn_100x75.png");

undef $thumbnail;

exec "file /home/mhenkel/*.png";

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