yes that is exactly what i am looking for. I insert the hidden watermark myself as shown in the code in my original post. The problem is I do not know the syntax needed to read it back out and check. I tried to use your code suggestion but that only prints me out the original base image which doesn't verify anything. I can't seem to uncover the syntac needed to extract the stegano inserted. 
my $background=Image::Magick->new(magick=>"gif");
    $background->BlobToImage($bin_data);
    $background->Set(size=>"100x100+1"); #size and offset of watermark
+ inserted
    $background->Read('stegano:result.gif');

    $background->Write("gif-");
    
    $bin_data = $background->ImageToBlob();
    print "content-type: image/gif\n\n";
    print $bin_data;

[download]
this only prints the full sized original image. not the watermark and it doesn't even display an image of the correct size. It shuold be 100x100 but instead is the regular full size of 640x460? thanks

In reply to Re^2: Image::Magick stegano question by bear0053
in thread Image::Magick stegano question by bear0053

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