LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Relations between cam_xyz and rgb_cam

Submitted by Jay L on

Hi,

First of all, thanks for library. I have to say LibRaw is amazing.

I was confused when I tried to transform color space between camera color space, sRGB, and CIE XYZ.

I have read the documents from https://github.com/LibRaw/LibRaw/blob/master/doc/API-datastruct.html
It seems cam_xyz converts from camera color space to CIE XYZ, and rgb_cam converts from camera color space to sRGB.

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MetaData

Submitted by mvms2015 on

Using exiftool on a .CR2 photo converted to DNG, the following tags can be seen in the printout.

AS_SHOT_NEUTRAL
Raw Data Unique ID

However, when unpacking an image captured from the same camera (Canon 7D), I cannot find that data in the libRaw.imgdata structure, despite reading through the sub-structure data several times when in debug mode. I have found almost everything else needed.

I also scanned the documentation.

Any help wold be welcomed.

Thanks. Great library.

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Extracting RAW histogram

Submitted by assaft on

Hi!
Is it straightforward to extract/build a RAW histogram (as a bitmap or even just as an array of values) from/using LibRAW?
I have a license for RawDigger and I'm using it for producing the histogram charts but I want to integrate this functionality into another application.
Thanks!
Assaf

p.s. I hope I'm posting in the right forum.

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Generate configure script for Mac OSX

Submitted by johann on

Hi,

first, thanks for your work on LibRaw, it is very much appreciated.

Now, i'm running into problems, when trying to build from the latest sources from github. (I used the zip-download from github.)

Some context: I'm on Mac OSX 10.8.5. I could successfully build libraw from latest release version (0.16 from libraw.org) via "./configure, make, make install".

But i could not find the 'configure' script in the github-zip. Is there a documented or recommended way to generate the configure script for Mac?

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problem setting up gamma curve to use on .CR2 raw file

Submitted by jan.hulek on

Hi,

I'm having a problem when trying to set up a gamma curve to use when processing data from .CR2 file.

The result is always the same (doesn't matter the values i set up).

Here's what my code looks like (pseudocode):

Rawprocessor;
Rawprocessor.openfile(file);
Rawprocessor.unpack();
Rawprocessor.imgdata.params.output_bps = 16;
 
Rawprocessor.imgdata.params.gamm[0] = 1.;
Rawprocessor.imgdata.params.gamm[1] = 1.;
 
Rawprocessor.dcraw_process();

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Chromatic Abberation errors, blue halo

Submitted by TimZ on

Hi!

I am using the default demosaicing functions in libraw (AHD), and i have the automatic chromatic abberation correction on. Often this works really well. Just sometimes however, this gives very strange results as can be seen in the attachment. I call it purple or blue halo's. I am absolutely sure it has to do with the chromatic abberation detection. Any ideas or questions?

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Sony ILCE-6000 - problems reading raw image data from .arw files

Submitted by lops on

Hello,

just tried to read in Sony ILCE-6000 raw image files, EXIF data seems to be ok, but the arrays with the rgb channels are filled with zeros. My routines have already worked with EOS 550d raw files. It seems that ILCE-6000 raw files are not compatible with your library. Any suggestions ?

Greetings,
lops

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