Talk:CHDK/Samples: RAW

dynamic range increase with RAW
After reading this page which describes how you can test the dynamic range of your camera, I did a quick&dirty test with my A610 and found this at the lowest ISO setting:


 * RAW: 10.3 stops
 * Jpeg: 9 stops (highlights blown sooner than RAW, shadows are the same)
 * Jpeg with 'neutral' color setting: 9.3 stops

So RAW shooting seems to give about 1 more stop of dynamic range, at least with my cam.

To do this test, I printed a sheet of paper with white, grey and black as proposed in your article. Then I took multiple photos and looked

a) which the first photo was where you can barely see all three colors (after boosting contrast) and b) which the last photo was where you can barely see all three colors. Then I counted the stops between these two pictures.