LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Sony A7 II and LibRaw 0.19

Submitted by David Partridge on

When I am processing raw files using LibRaw I check that the camera is supported by looking it up in the array of supported cameras pointed to by LibRaw::cameraList(). For most cameras so far this has worked well so long as I use a case independent comparison (e.g. Fujifilm versus FujiFilm). I do this so that I can warn users that their camera isn't supported by LibRaw because the results may not be as expected.

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DNG image with YCbCr photometric

Submitted by mact on

Hi,

I am sending a link to info (a..t) libraw.com for a DNG file that I would like to understand how to interpret. It seems to be color-encoded with YCbCr color. Yet, if I convert from YCbCr/YUV to RGB after demosaicing, I get an extreme color shift (using old dcraw code as a base).

Libraw *correctly* interprets the file, outputting a good RGB version. Also dcraw_emu correctly handles it.

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Possible bug with Panasonic G9 hi-res raw files

Submitted by treben on

Hello, I've recently come across some strange behavior related to the Panasonic Lumix DC-G9's hi-res mode raw files and apps that I believe use libraw for decoding (such as the photos app in windows with the raw codec).

The first issue I've experienced is an unnatural green tint with both the hi-res raw file and the 20mp raw file that gets taken simultaneously in the hi-res mode. A shot with the same settings but not utilizing the hi-res feature does not show this issue.

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unpack() performance?

Submitted by dbriard on

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!

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Problems with certain DNGs - strong color casts

Submitted by Wojciech Toman on

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:

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