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RAW data vs. rendered image

Ahh thanks, I think you just helped me understand something.

I haven't checked, but I'm almost certain you're right about it using the rendered image. My understanding is that ImageMagick delegates all the decoding to libraw, libjpeg, libtiff, libpng, etc., and in my case it doesn't necessarily know it's dealing with a RAW image by the time it creates the signature.

So let's say I wanted to write my own signature program using LibRaw that only operates on the image data, leaving the metadata completely out of it. After a quick look at the API, my best guess is that I'd want to hash the contents of libraw_rawdata_t. Does that sound right?