LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Access RGB values from libraw_processed_image_t

Submitted by lanthale on

I am under way to build libraw support for another media management system called Photoslide (github.com/lanthale/photoslide) and wanted to add libraw support.

Using java and the foreign memory api I can access libraw without any issues.

Nevertheless I am facing the issue how I can access the rgb (rgba) values of the in memory image because I do not want to write first a tiff file and then read the pixels again from the temp file.

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Access RGB values from libraw_processed_image_t

Submitted by lanthale on

I am developing an interface between javafx and libraw. Generally it is now working but only if I write directly to a TIFF or PPM file. I do not want writing first into a temp file and reading again from that file. Instat I want to use the memory image from libraw.

The problem actually I am facing with it is accessing the data from the call "libraw_dcraw_make_mem_image". From the documentation it should be an array of rgb pixels but all I am getting is one character back from an memorysegment.

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Building shared library on all OS's

Submitted by lanthale on

Hello everybody,

I have written an opensource media management application (https://github.com/lanthale/photoslide) and want to integrate libraw into my app.

My app is written with JavaFX and therefore I want to use libraw via the newly ability of JDK16 to access native libs (C Libs) without writing any glue code.

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Windows & LCMS

Submitted by AndyBell on

Hi

The installation notes just say that the Windows version compiles without LCMS support...

Does that mean there's no (reasonably easy) way to compile LibRaw in Visual Studio and LCMS support?

If it can be done, I'd like to as most of my pictures are taken with Adobe or ProPhoto profiles and look wrong when developed in LibRaw.

Many thanks

Andy

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Again CR3 images from EOS-R5

Submitted by herb on

Hello,

I downloaded an CR3 image with name 023A9867.CR3 from
https://www.dpreview.com/sample-galleries/8198842835/canon-eos-r5-sample...
but using the latest snatshop 202101 I cannot generate a *.tiff image.

Using dcraw_emu.exe I get: Cannot open 023A9867.CR3: Unsupported file format or not RAW file

The problem seems to be with file_open.

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Some Lumix DMC-LX100 II images are coming out magenta

Submitted by asdiele on

Hello!

It looks like there is a subset of Lumix DMC-LX100 II images that are coming out magenta. I intercepted the Bayer pattern outside of LibRaw and it is coming out as:

12
01

if I manually change it to
21
10

then the image is demosaiced correctly. It looks like the pattern is off by one.

I should mention FastRawViewer is also showing the incorrect color.

Is this a known issue? Is there a patch or could you point me to where in LibRaw it could be fixed?

Thanks!

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Canon R5 .CR3 files open with incorrect colors

Submitted by lemkesoft on

Hi,

CR3 files from the new Canon R5 open with incorrect colors.
Is there a workaround with the current libRAW?
I uploaded some samples to:
https://www.lemkesoft.org/temp/1.CR3
https://www.lemkesoft.org/temp/2.CR3
https://www.lemkesoft.org/temp/3.CR3
https://www.lemkesoft.org/temp/4.CR3

Thorsten

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Trying to use libRAW 0.20.2 in FreeImage 3.18.x

Submitted by Mpi on

Hello,

maybe someone can help me with this:
-> I am trying to get the actual LibRaw 0.20.2 into FreeImage 3.18.0. Due to the reorganized code in LibRaw 0.20.2 i get the following error in the PluginRAW.cpp of FreeImage: "Identifier 'substream' not declared"

It seems the 'substream' has been declared within LibRaw before, with the version 0.19_201910_snapshot and the 0.19.5 rc it works fine to put the LibRaw code into FreeImage 3.18.x and build that library.

Hopefully someone has an idea, as a I am trying to figure this out for days...

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std::map with LibRaw

Submitted by hunku on

I have a problem with LibRaw(0.20.2, MSVC2012) using std::map

Here is the test code
----------------------------------------------------------------------
std::map test;
test["elem1"].imgdata.params.user_qual = 10;
----------------------------------------------------------------------

There is no compile error, but runtime error occurs at

"test["elem1"].imgdata.params.user_qual = 10;"

I don't know why std::vector is work well but std::map is NOT work well.....
Does anyone know how to fix this error?

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