Hi, I'm trying to overlay 3 images using the Image::Magick module but I'm having trouble achieving the desired result. I have a background image (pure white background created on the fly), a foreground image (a jpeg I read from a file, which I want to overlay onto the background with an opacity of 87.8%) and a mask (a png with transparency) that overlays the whole thing.

From the command line, this is the result I'd like to achieve:

composite -dissolve 87.8 foreground.jpg -size 500x500 xc:white output.
+jpg; composite mask.png output.jpg output.jpg

[download]
I've written some code in perl using Image::Magick which looks like this: 
my $mask = Image::Magick->new;
my $background = Image::Magick->new;
my $foreground = Image::Magick->new;

$mask->Read("mask.png");

$background->Set(size=>'500x500');
$background->Read("xc:white");

$foreground->Read("foreground.jpg");

$background->Composite(compose=>'Dissolve', opacity => '87.8', image=>
+$foreground); 
$background->Composite(image=>$mask);
$background->Write("output.jpg");

[download]

For some reason the opacity is being ignored (changing the background image from white to red, or blue, has no effect on the image). Any help would be appreciated.

In reply to Setting opacity with dissolve in perlmagick by shohn

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