Hi everyone,

I am new to LibRAW and I am wondering if the unpack() performance should be that slow. I am using LibRAW on a Windows 32-bit program and unpack()+dcraw_process() take around 20 seconds for a typical 6000x4000 image. I tried several RAW file formats: NEF, CR2, Sony, Olympus and all file load very slowly.

Then I took a look at FastRawViewer that is using LibRAW and (if I am right) do not display a JPEG preview, and it load the same RAW files in 1 second!

I have never been able to solve this problem
Many different scenarios and tries

I know it is trivial

In windows command line

simple_dcraw produces ppm
simple_dcraw -L gives list
simple_dcraw - e gives thumb
simple_dcraw -T

always crashes
and
gives empty .tiff

Any thoughts

Thanks

I'm using 201903 snapshot and having issues with certain DNG files in the RAW converting code we're using.

1) One of them has strong yellow colour cast.

It turns out, one of the elements in the embedded colour matrix array is being overridden due to other array being accessed incorrectly in identify() function dcraw_common.cpp, line 20728:

I'm seeing some odd results when processing a DNG from a Pentax K5-II. Exiftool reports:

======== IMGP1593.DNG
Black Point                     : 513 513 515 516
Black Level                     : 513 513 515 516
Exposure Time                   : 1/8000
ISO                             : 800

Yet after calling LibRaw.unpack() I see

Hello,

I'm using LibRaw to process RAW files on Windows. I'm using the March Snapshot built with Visual Studio 2017, 64-bit,

I'm having problems with EXIF orientation in several RAW files, mostly Canon CR2 files.
When the user enables the option to use the embedded preview in the CR2, my software uses the routines

unpack_thumb
dcraw_make_mem_thumb

to create an in-memory image and then I load that image into my image library for further processing. After loading the image my code checks the

imgdata.sizes.flip