I am using a canon ixus 300 HS camera and configured it to shoot RAW (DNG) by using CHDK (version: 1.0.0-1825; latest build for ixus 300 HS). At first sight, all seems ok and the DNG's are generated nicely, but when looking closely (ie. zooming in), there are a lot of stuck/dead pixels on the image.
Although the CHDK documentation stated that for DNG dead/stuck pixels are always resolved (apparantly this is mandatory for DNG standard) by using some kind of interpolation algorithm, it does not work no matter what I set as 'Bad pixel removal' option (Average or RAWConv.) I still see the dead/stuck pixels. I have generated the badpixel.bin file for this to work without any errors.
My question now is how to solve this either in CHDK or even better in post-processing where I have more control (in the latter case, preferably in Darktable, not LR)?
Detail with stuck pixels: https://www.dropbox.com/s/j35pcba3hz37ovs/DetailWithStuckPixels.png Original DNG: https://www.dropbox.com/s/mufnsrxcqzfbnwj/CRW_6640.DNG (ca. 16MB)