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Convert pdf pages to a picture

 $ gs -sDEVICE=pngalpha -o <output-%04d.png> -r1200 -dFirstPage=<start page idx> -dLastPage=<end page idx> <input>

n.b., the resolution of 1200 pixels for inch is quite large. Probably one wants to convert the result in smaller files.

Remove pictures from a pdf file

 $ gs  -o noimage.pdf  -sDEVICE=pdfwrite -dFILTERIMAGE <input>

Convert an image to black and white

  $ convert <input> -colorspace HSL -channel L -separate <output>
cs/imagemagik.txt · Last modified: 2020/04/19 02:14 by paolo_bolzoni