LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

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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NarrowedType fixes for Clang

Submitted by Danoli3 on

Hey,

I've was having some trouble compiling LibRaw a few months ago with LibRawLite using clang on OSX.

The source of the issue was incorrect sized types in internal/dcraw_common.cpp

The following errors were being thrown:

Constant expression evaluates to 128 which cannot be narrowed to type 'signed char'

Constant expression evaluates to 136 which cannot be narrowed to type 'signed char'

Constant expression evaluates to 65535 which cannot be narrowed to type 'short'

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LibRAW licence

Submitted by hulkee on

Hi,

I'm thinking about using libraw in my project (linking to it, not modifying in any way). But I'm a bit baffled by the licence under which to use it. There is a post on this forum about using libraw under the LGPL or CDDL licence, but the main page is speaking about GNU GPL v2 and later.

My project is going be closed source application made for a third party and GPL licence might be a problem, is it possible to use some different licence for using libraw?

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