dcraw_emu.exe versus dcraw.exe

Submitted by pocruadhlaoich on

Hi,
I wanted to compare the images generated by dcraw_emu.exe and the latest version of dcraw, which I compiled on Windows 7 using:

gcc -o dcraw.exe -O4 dcraw.c -lm -lws2_32 -DNO_JPEG -DNO_LCMS -DDJGPP

I then ran both dcraw.exe and dcraw_emu.exe with the same command line parameters:

dcraw.exe -g 1.0 1.0 -W -q 3 data.cr2
dcraw_emu.exe -g 1.0 1.0 -W -q 3 data.cr2

using this image:

http://www.filefactory.com/file/b345c12/n/data.cr2

I would have thought that the output .ppm file would be binary identical from both tests but I can easily see that the result from dcraw_emu.exe always appears brighter than dcraw.exe across the entire image. Is there a step that I am missing or can you explain what is going on here please?
Thanks,
Patrick

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LibRaw (and, so, dcraw_emu)

Submitted by lexa on

LibRaw (and, so, dcraw_emu) contains 'auto-maximum' feature to deal with 'pink clouds' problem.
If you want to produce files which are binary identical to dcraw's results, you should switch this option off. Use -c 0 switch of dcraw_emu to do that.

-- Alex Tutubalin @LibRaw LLC