10 jpegoptim --strip-all -m$qual "$X"
13 if convert "$X" -depth 16 RGBA:- | perl -e 'local $/ = \8; while(<>) { substr($_, 6, 2) eq "\xFF\xFF" or exit 1; ++$pix; } END { exit not $pix; }'; then
14 echo "$X has no alpha, converting"
15 convert "$X" -quality 100 "${X%.*}.jpg"
16 jpegoptim --strip-all -m$qual "${X%.*}.jpg"
19 echo "$X has alpha, not converting"