LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Question for LibRaw installation

Submitted by Vincent_do on

Hi guys,
I know a few people have asked this question, but no satisfied answer that I can find. So please help:

I am trying to install on Windows and using with visual studio.
And I don't understand this line in documentation:
"Set the environment parameters so that the compiler/linker would find the libraries and include-files. For Visual C++, this is done by running vcvars32.bat."

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Noticeable difference between LibRaw and dcraw in DNG processing

Submitted by anhel on

Hello,

I'm experimenting with DNG images loading. I'm using LibRaw and I'm trying to achieve the same result as with dcraw processing, but I can't. White balance is different (see. image in the attachement).

dcraw command I'm using (it's dcraw 9.26 built from the source code):

dcraw -h sunset.dng

dcraw_emu command (it's LibRaw 0.20 built from the sources):

dcraw_emu -h -c 0 sunset.dng

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Help required for understanding coordinates

Submitted by AngoGonTal on

Hi there,
I am a student, who tries to implement a routine for homework. I am totally new to this library and it took me a while to link it to my VS2019 environment. But now it basically works fine, but...

I am currently starting with a vertical slice of my homework. So I try to figure out, how to read out indivduell pixel color information. Unfortunately I pick implausible values.

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Problems to compile libraw with gpr_sdk enabled

Submitted by herb on

Hello,

I downloaded latest beta1 of libraw 0.20, compiled it with gcc 7.3 inside CodeBlocks IDE.
All is working fine.

No I enabled gpr_sdk as follows:
- I set both compiler options USE_GPRSDK and USE_DNGSDK
- I downloaded gpr_sdk from https://github.com/gopro/gpr as given in file README-GoPro.txt
I did no modification to any of these files
- I put the options where to find the *.h files and tried to compile libraw

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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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