LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Getting all available data and still get the right active area from DNG

Submitted by King_DuckZ on

Hello, I have a DNG file that specifies DefaultCropOrigin and DefaultCropSize in its metadata. Using libraw I'd like to get all the sensor data available in the DNG file while still retaining informations about the default crop, so that the extra data doesn't get trimmed at this point.
I've patched dcraw_common.cpp to read the default crop info, but I'm still unable to get the result I want.

For reference this is my patch, though at this point I'm not sure this is the right way to do it:

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Issue with Canon PowerShot cameras

Submitted by Stepdan on

Hello! I have some problems when open photos from:
Canon PowerShot G1 X,
Canon PowerShot G5 X,
Canon PowerShot G7 X,
Canon PowerShot G7 X Mark II,
Canon PowerShot S120,
Canon PowerShot S130 IS.

There is a vignette effect on every photo made by this cameras.
(Photo from http://www.rawsamples.ch/index.php/en/canon).

Tried v 0.18.6 and built libraw from master, but it didn`t solve the problem.

For example, OpenCV 3.3.0 opens this files correctly.

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DNG file causes crash in LibRaw 0.19-Snapshot-20170812

Submitted by earlotti on

Hi,

I have a DNG file that causes a crash in LibRaw 0.19-Snapshot-20170812 (no problem with LibRaw 0.8.16). The crash happens in the "unpack" function.

I used the Visual Studio project provided in LibRaw 0.19-Snapshot-20170812 without changing any settings. I opened and compiled the project with Visual Studio 2010 Express in 32bit / release mode. I did the same with LibRaw 0.18.6 and got not problem.

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Issue with PEF file

Submitted by earlotti on

Hi again,

While browsing this forum, I found this post "Issue with Pentax *istD" (3 May, 2017 - 14:53) about a Pentax PEF file that did not decode correctly in version 0.18.2, but did work in 0.17.2. A patch was proposed in the same post.

The file is still available at :
http://www.rawsamples.ch/raws/pentax/star_d/RAW_PENTAX_STARISTD_SRGB.PEF

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Problem opening IIQ files

Submitted by earlotti on

Hello,

I have been using libRaw 0.15.4 (Windows 32bit) in my application since 4 years. Recently, we received some CR2, NEF and IIQ files that libRaw 0.15.4 was not able to process correctly (strange colors rendering or errors on opening). I decided to upgrade to a recent version of libRaw, so I tried libRaw 0.18.15 and 0.18.16 and it seems that most problems have gone away except some IIQ files that cannot be opened (while libRaw 0.15.4 worked well on these files).

I try to open these files with this simple code :

LibRaw rawProcessor;
in result;

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Use LibRaw with CodeBlocks and mingw on windows

Submitted by Hamster1er on

Hi everyone,

I would like to open a .cr2 (from my Canon 6D) file, play with it and compare the result with already existing demosaicing algorithms.
I use codeblocks 16.01, mingw x64 5.0.3 (g++ version 7.2.0) and openCV 3.3.1 on Windows 10 x64.
I downloaded the latest LibRaw sources.
But i can't compile a simple program :

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Variable Contrast

Submitted by james on

Hi there,

I've been trying to use LibRaw on a project, but keep running into an issue where the output images don't look "contrasty" enough -- they differ substantially in contrast from both the embedded previews in the JPEG, as well as ACR and FastRawViewer (which I understood uses libraw internally?)

Looking in FRV, there's an option called "contrast curve type", which is set to "variable contrast" -- I think this is what I'm missing.

How do I invoke libraw such that it mirrors the "variable contrast" setting, so that my images look right?

Thanks!

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