Imager transparent background instead of black

[Anonymous Monk]

I'm using Imager to generate thumbnails and center them on a background. When I create a new image with Imager->new how do I tell it to make the background transparent (or even white) instead of black?

[Khen1950fx]

I'd use Imager::Fill.

#!/usr/bin/perl

use strict;
use warnings;
use Imager;
use Imager::Fill;

my $fill = Imager::Fill->new(type => "opacity",
           other   => $fill,
           opacity => 0.25);

where $fill is The Imager::Fill object you want to modify, and the default opacity is 0.5. You can modify the opacity to get the level of tranparency that you want.

[Anonymous Monk]

• grep -C2 background
• grep -C2 transparent
• grep -C2 alpha

[tonyc]

By default Imager->new creates a 3 channel image, which has no alpha channel.

To create a transparent image, create a 4 channel image:

my $im = Imager->new(xsize => $width, ysize => $height, channels => 4);