ImageMagick provides the mogrify
command.
Options:
- -colorspace RGB - converts CMYK to RGB (needed for TIFFs)
- -density 72 - sets DPI to 72 (needed for TIFFs)
mkdir -p out &&
rm -rf out/* &&
mogrify -colorspace RGB -density 72 -format jpg -resize "1024x1024>" -quality 75 -strip -verbose -path out/ *