Mark Whitis - 2010-06-14

Actually doesn't work for low res images, either. It only uses a narrow slice.

frame0001.png PNG 480x270 480x270+0+0 8-bit PseudoClass 256c 57.3kb

but gpiv turns that into a 480x135 pixel slice.

Here is the origins of the HD files:
youtube-dl -f 37 http://www.youtube.com/watch?v=f4i_mN_AWvU
ffmpeg -i ../f4i_mN_AWvU.mp4 frame%04d.png
mkdir gray
for i in frame*.png; do echo $i; convert -depth 8 -type GrayScale $i gray/$i; done

All 4 clips from the deepwater horizon BP oil spil are here:
http://www.energy.gov/open/oilspilldata.htm

Download link that doesn't require youtube-dl.
http://v2.cache6.c.youtube.com/videoplayback?ip=0.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor%2Coc%3AU0dWS1FQVF9FSkNNNl9JSlhJ&fexp=904510&algorithm=throttle-factor&itag=37&ipbits=0&burst=40&sver=3&expire=1276156800&key=yt1&signature=C1AB623CC868B2FCCA6E8A902945165D22273961.C5280C974F245E5B5754F21BA49E9418A1B1214C&factor=1.25&id=7f88bf98dfc05af5&redirect_counter=1