GD would be the way to go, given "
Image::Resize - Simple image resizer using GD". I'm currently using it for doing PNG->JPG conversion/sizing and the docs mention that GD supports WBMP (which I assume means "Windows .bmp"), although I wasn't able to quickly find a complete list of formats supported by GD.
Some sample code to help get you started:
binmode $img_fh;
local $/;
undef $/;
my $img = GD::Image->new($img_fh) or die "Failed to read image file:
+ $!\n";
# ...
my $fh;
my $fullpath = "$path/$filename" . ($png_img ? '.png' : '.jpg');
open $fh, '>', $fullpath or die "Failed to write image file: $!\n";
binmode $fh;
print $fh ($png_img ? $img->png : $img->jpeg);
close $fh;
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