acetone
For the A590-IS, this probably isn't worth the trouble. The RAW files only have 10 bits of dynamic range, and the JPEG files have 11 bits of dynamic range, compressed into 8 bits with a gamma curve.
Well, how could possibly jpegs have an higher range, if they use data from a lower density source? that extra bit does not add any useful info to what is already there.
acetone
vinmar
@bugmenot: CRW is a raw file (Canon Raw -> CRW (?))
All raw files should be the same dimensions, for an A590 it will always be 8 megapixels.
The RAW file is actually a bit higher in resolution than the JPEG output. This is because the camera shoots a little extra information on the sides to prevent problems with demosaicing/denoising the edges of the image (10-30 pixels for this camera, from what I see). There is also a dead zone on the sensor outside of this, which does not produce light, but your RAW software will remove this.
Going from the info for the Powershot A720-IS, which has the same-size RAW file & sensor, the A590-IS has a 3336x2480 sensor, of which 3292x2466 is active area. Some of this gets cropped out after RAW processing by the camera to produce its JPEG file (about 10-30 pixels on each side). So yes, the RAW file will have slightly higher resolution.
True but more precisely (from firmware): final resolution 3264*2448, raw sensor resolution 3336*2490; as i was saying in another thread, actual raw file size is the same as
A720 just to let dcraw handle the resulting file.
