Images and PDFs
Convert PNG to Icon
first convert to 256
convert input.png -resize 256x256 output.png
last convert to icns
png2icns output.icns input.png
PDF to one image
convert in.pdf +append out%d.png
sudo apt install imagemagick
If convert is broken, update policy:
# Open the file
sudo nano /etc/ImageMagick-6/policy.xml
# find and edit the line
<policy domain="coder" rights="none" pattern="PDF" />
# to :
<policy domain="coder" rights="read|write" pattern="PDF" />
Raw to JPG
ufraw-batch --out-type jpeg *