how to imagemagick

quick dozens write this shit down before you forget

resize an image: convert -resize 800 in.png out.png
do a watermark: composite -compose multiply -gravity center -geometry +0+0 watermark.png page.png out.png
convert pdf pages to individual png (accounting for weird transparency stuff): convert pages.pdf -quality 50 -background white -alpha remove -alpha off pages.png
gif shit: convert -delay 2 -loop 0 *.jpg -layers Optimize out.gif; convert file.gif frames.png
dither and reduce colors: convert image.png -quality 70 +dither -remap netscape: out.png