It is difficult to recommend It is difficult to recommend any specific document/site. May be 'dcraw annotated' will help: https://ninedegreesbelow.com/files/dcraw-c-code-annotated-code.html (at least, LibRaw postprocessing is derived from dcraw.c code, so this specific document is applicable to LibRaw::dcraw_process() code) -- Alex Tutubalin @LibRaw LLC reply
It is difficult to recommend any specific document/site. May be 'dcraw annotated' will help: https://ninedegreesbelow.com/files/dcraw-c-code-annotated-code.html
(at least, LibRaw postprocessing is derived from dcraw.c code, so this specific document is applicable to LibRaw::dcraw_process() code)