You will need to get over your aversion to non-core modules.
The utility "import" from ImageMagick ( installed on most machines ) can capture the root window to a "blob", which can be manipulated by Imager or ImageMagick.
my $blob = `import -window root jpg:-`;
#my $blob = `import -`; #postscript produced
# now $blob is in memory and you can do what you
# want with it.
my $output = Image::Magick->new(magick=>'jpg');
$output->BlobToImage( $blob );
# png works too
# or use Imager
# Convert image
my $img = Imager->new;
or die "Cannot read: ", $img->errstr;
#See perldoc Imager::Transformations
my $rot20 = $img->rotate(degrees=>20);
or die "Cannot write: ",$rot20->errstr;
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