LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Support of monochromatic DNG in LibRAW

Submitted by anhel on

Hello,

First of all, thanks for your great work.

I have an issue with reading monochromatic DNG image. The result is pretty weird. I can't figure out if there are problems with the source DNG image itself, or with LibRaw. Maybe I'm using it wrong, but usually DNG images are loaded pretty well. But not this one.

In the attachement there is comparison image just to take a quick look at the problem.

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libraw_set_exifparser_handler - what is the void *datap parameter

Submitted by AndyBell on

Hi

I'm trying to call libraw_set_exifparser_handler(...) after calling libraw_init()...

However, I can't see what I should pass as the void *datap parameter...

I can't see the answer in the Documentation. It mentions the LibRaw_abstract_datastream in the C++ API but how do I get this in the C API?

BTW, I'm using CodeGear C++ Builder 2007 and can use the basic C API but my attempts to use its LibRaw class always result in a linker error...

Any advice would be appreciated.

Andy

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Verbose output from dcraw_process with DCRAW_VERBOSE

Submitted by amaschas on

I did a bit of searching, and an earlier thread mentioned setting DCRAW_VERBOSE when compiling to get verbose output when running dcraw_process. However, when I search the libraw code for DCRAW_VERBOSE, the only reference I can find to that string is in a changelog. Is this still the right way to turn on verbose output?

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Camera name in supported camera array doesn't match

Submitted by David Partridge on

A small problem with the supported camera array:

The 0.19.5 array of supported cameras says "Olympus E5 Mark II", but the camera reports "Olympus E5MarkII", so when I check against the array I don't get a match. Will you be able to fix this in the next release?

Are you yet in a position to say (plus or minus a few weeks) when you'll be releasing the next "Stable" release?

Many thanks
David

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C++ Builder issues

Submitted by AndyBell on

Hi

I'm using Libraw 0.19.5 Release 32 bit DLL with Codegear C++ Builder 2007 32 bit

I've used its implib utility over the DLL to create an import library and am referencing libraw.h

But I always get a link error [ILINK32 Error] Error: Unresolved external '_libraw_init' referenced from H:\LIBRAW\DEBUG\UNIT4.OBJ

I've tried changing DllDef to __declspec in the header, but no joy.

So I tried using LoadLibrary() instead and always get error 193 (is not a valid Win32)...

Does anyone know how to overcome this?

Thanks

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Canon 80D colors seem to be wrong

Submitted by 10110111 on

I'm trying to use LibRaw to convert CR2 files from Canon 80D, and when I use rgb_cam combined with pre_mul, I get some not quite realistic colors. In particular, it looks too orange to me. It appears as if the old Canon 1100D got it more "right" than the new 80D.

I then took some photos of my monitor showing RGBCMYK colors and lighter versions of them with 80D, and also measured these colors with SpyderX. After I made my own camera-to-sRGB color conversion matrix using these data, I got some better results.

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Inverting raw_image and getting magenta output

Submitted by amaschas on

Hi all, I'm rather new to using libraw, so I apologize if this question is somewhat naive. I'm trying to build a set of tools for handling DLSR captures of film negatives, and I'm attempting some tests to verify my guess that performing several steps in the negative inversion process using the RAW sensor data rather than interpolated data that has been converted to a color space will provide some advantages. I'm using a RAW capture of a color film negative from an A7r IV that I've converted to a DNG for this test.

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