| convert | convert between image formats as well as resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. |
| identify | describes the format and characteristics of one or more image files. |
(manpage)
| Option | Wirkung |
| -alpha remove | entfernt Transparenz |
| -background white | setzt weißen Hintergrund |
| -trim | schneidet den Rand des Bildes weg |
# general JPG to PDF
convert img1 img2 img3 ... out.pdf
# multiple JPGs to one PDF
convert -append img1 img2 img3 ... out.pdf
(Quelle [reddit])
# convert page 17 in 300dpi
convert -density 300 input.pdf[16] output.jpg
find -name "*.jpg" -exec mogrify -resize 75% -quality 80 {} \;
find -name "*.jpg" -exec mogrify -strip {} \;