Hi everyone, i have an ixus 107, with i think is the same thing as 105/SD1300 (firmware 1.00D) and i found that raw dng files come out cropped to 10mp.
If you look back in this porting thread (around March 2012), you'll find some discussion about this.
If you can run Win32 programs,
here is a modified version of DNG4PS-2 that allows importing and exporting single camera definitions. I've attached an Ixus105 definition that can be imported with settings -> camera options -> import cam.
It's not proper, especially the color matrix values. You could play with the "
active zone" values to see what part of the RAW is worth to keep. As I remember, it's a bit difficult to choose (there is some image data near the corners that is darker, but sort of usable). If you can come up with values that you find good enough, post them here (with example pictures if you want). DNG4PS-2 needs RAW files (CR2 in your case), not DNGs as input.
Why all this? As I don't own this camera, I don't want to be the one who chooses the "right" values.