If I understand the Image::Grab docs correctly, it just returns the image as binary data. According to the docs, Image::Magick supports reading filehandles, which you could use with an in-memory filehandle (open), as well as reading data in memory directly:
my $image = Image::Magick->new(magick=>'jpg');
open my $fh, '<', \$imgdata or die $!;
$image->Read(file=>$fh);
# - or -
$image->BlobToImage($imgdata);
(untested)
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