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Tiff output has different resolution to the raw Image?


I'm fairly new to using this library. I'm using the API to convert raw in c++ and output it as a tiff. I'm using the dcraw_process() function to do this. The only thing is the tiff is the wrong resolution. I wonder if there is a setting or something that I am missing. The raw image is 3648x5472 but the tiff is 3670x5496. Raw image is .cr2 format and was taken on a 1dx mark II. Any help or advice would be appreciated.