transparency - ImageMagick: How to make both black and white transparent? -
converting black , dark shades transparent works fine imagemagick. managed perform crop , resize in same line. convert input.png -background none -fuzz 45% -transparent black -flatten -crop 640x480+12+9 -resize 105% output.png however, input image contains number of white lines, convert transparent in output. how go that? possible within same command line? sure, add second -transparent . convert -size 512x512 gradient:black-white a.png # create initial black-to-white gradient convert -fuzz 20% a.png -transparent black -transparent white result.png # lose 20% off black end , white end or, fuzz... convert -fuzz 40% a.png -transparent black -transparent white result.png