Nice to see Purge RAW on the A590IS is going to be fixed.
Also, A590IS CRW/DNG files seem to have artifacts on the raw borders-edges,
the borders need to be trimmed to clean that out.
This guy has done some cropping-trimming work in the A470 porting:http://chdk.setepontos.com/index.php?topic=3368.msg34491#msg34491
Can we use this to fix the artifacts problem on the raw borders in the A590IS ?