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Thanks Alex. Given your reply

Thanks Alex. Given your reply, am I correct in assuming that applications like FastRawViewer are not using dcraw for processing and are instead using their own algorithms?

On a related note, in Apple's Core Image framework for macOS, they have a filter called CIRawFilter that can take RAW data as input. The header file states that the following formats are supported:

kCVPixelFormatType_14Bayer_GRBG, 
kCVPixelFormatType_14Bayer_RGGB, 
kCVPixelFormatType_14Bayer_BGGR, 
kCVPixelFormatType_14Bayer_GBRG

If I want to try and use Core Image for post-processing, is there a way to get the unprocessed image data from LibRaw in any of the formats listed above?