The black corners are normal on the canon powershots.In order to reduce production cost, they try to use the smallest lens possible, and find rely on software correction and in camera cropping...
For the jpegs, a 12 megapixel image may actually be like 11.8 megapixels or less, and then the camera corrects for as much distortion as it can, then crops, then interpolates back to 12 megapixels.
I apologize if generated confusion with my "teory" about asymmetrical black corners in raw and lens barrel misalignement.
Thanks for your quick anwswers guys!Here is a sample of a RAW picture with the FULL crop size.https://www.dropbox.com/s/hpxsrlhrxh3ogju/IMG_3167.DNG?dl=0Best,C.
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