Renumbering files in consecutive order

Here is a small script I used to renumber files in consecutive order. Of course you need to change it to suite your needs.

files=`find . -name "images*.pgm"`

i=0

for f in $files;

do

i=`expr $i + 1`

newf=`printf "test/images%03d.pgm" $i`

mv $f $newf;

done

How to batch extract frames from video

I also needed to extract frames from a video , for that I used ffmpeg

ffmpeg -i movie1.MPG -r 1 -f image2 frames/images%d.png

Batch converting images

Today I had to batch convert images from png to pgm. Here how you can do it using Imagemagick

mogrify -format pgm *.png