LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

I think the ACES color profile in libraw is incorrect

Submitted by bkv on

This is in reference to using dcraw_emu, though I imagine this could be an issue for libraw in general. I was comparing the output of photos developed with ACES to output with ProPhoto in a color managed photo viewer, and I noticed the colors just seemed a bit off, they looked warmer than I would expect. So, I extracted the ICC profile from the photo and took a look at the primaries, shown in the forward matrix below.

R G B
X 1.00600 0.01668 -0.05212
Y 0.36885 0.72124 -0.08864
Z -0.00362 0.01096 0.75758

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Sigma X3F support

Submitted by lanthale on

I have just did some testing with my Photoslide app and recognized that I cannot open X3F file. During my forum search I found out that this should be possible with the first 0.20.2.

Do I have to enable some special flags during building to enable the Sigma X3F support ?

Thank you in advance.

best regards,
Clemens

Now offical build of Photoslide is supported by libraw https://github.com/lanthale/PhotoSlide/releases/tag/v1.0.16

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Dependency for distriubtion

Submitted by lanthale on

Thanks to the help here I have now created the interface for Javafx (https://github.com/lanthale/LibRawFX).

Nevertheless I am asking which native libs must I package with the shared lib (libraw.dll / libraw.20.so / ...) so that libraw is working as expected and the user does not have on a standard system (libjasper ?, libjpeg ?).

I am not an C expert and therefore I do not know if the libs are only compile dependend libs or if those libs are needed for runtime as well ?

Thank you in advance.

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Image data does not match

Submitted by bsunisol on

Hi,
I'm trying to code a very simple raw developing tool. First I want to read and understand the data libraw provides.

But the data I get does not represent the colors in PhotoShop by any means. They are not off by a some digits, they seem to be completely different. The data I get is in the xls and the coresponding first 10x10 pixels from Photoshop. Unfortuantely the cr2 is too big to upload.

What am I missing here or where is the "useable" image data stored?

Thanks and regards from Germany
Rob.

Here's a my code so far:

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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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