= IMAGEMAGICK
Working with images, PDFs and the command line
# convert from one format to another
convert image.gif image.jpg
# convert specific PDF page to image
convert -thumbnail x300 test.pdf[0] test.png
# create thumbnails for all pages in PDF document
convert -thumbnail x300 test.pdf test.png
# as above, controlling the width, having height suited
convert -thumbnail 400 test.pdf test.png
# crop an image from the bottom corner
convert -crop '595x711-0+1309' image.jpg output.jpg
# make a looping animated gif
convert -delay 20 -loop 0 image*.jpg image.gif
# resize image
convert -resize 50% source.png dest.png
# rotate image (-90 degrees)
convert -rotate -90 source.png dest.png
