http://www.perlmonks.org?node_id=778103


in reply to Re^2: Append images with ImageMagick
in thread Append images with ImageMagick

I don't think that syntax is valid. Even if "true" and "false" were declared as constants that would be something like $image->Append(stack => { 1 => 0}) I think you really want to just do:
$x = $image->Append(stack=>0);
Update: After testing, I found you need to explicitly set stack to 0. Despite what the docs say, Image::Magick 6.4.8 seems to stack by Default.