Easiest fix would be to extract always the full active sensor area. In this case 5202x3464 pixels. Extracting the default cropped active area, 5184x3456 pixels is just a waste. You have to crop the image later anyhow. That is also what other programs (MaximDl, SGP) are doing.

Some background info about the sensor areas can be found here:
www.barrypearson.co.uk/articles/dng/specification.htm#areas

Han

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