LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

LibRaw::COLOR or LibRaw::fcol

Submitted by sashab on

HI,

What is recommended way to detect color component of the pixel? Documentation points to COLOR function for this purpose, but as far as I understand it does not always work (e.g. FUJI XTRANS sensors). There is fcol function that is used everywhere in LibRaw internally, but it has somewhat different implementation that COLOR for bayer case. What to use?

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Command Line

Submitted by brancusi on

Hello,

Our project currently uses dcraw. We are having several issues and recently came across LibRaw.

Could you explain how we could transition to LibRaw while using the command line?

This will be running on an ARM distro of linux.

The app is actually running on a Raspberry PI within a dockerized node app. We are looking to grab the thumbnail, and then process the raw image with an applied color profile.

Any guidance in how to set this up would be greatly appreciated.

Thank you!

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Linking Libraw to VS project

Submitted by jomak on

I was able to compile the Libraw .lib, .dll, and examples programs successfully. I've tested the sample programs and they work. However, now I'm trying to link the library into a Visual Studio 2013 project I'm working on and can't figure out why it's not working.
Under Linker->Input->Additional Dependencies, I've added the path to the lib/libraw.lib file. At the top of my code I've also added a #include <libraw.h> and in C/C++->General->Additional Include Directories I've added the path to the LibRaw-0.16.2/libraw folder.

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LibRaw image size data vs Adobe interpretation

Submitted by Fimagena on

Hi,

I have been doing some comparison of the size data (i.e., libraw_image_sizes_t struct) that LibRaw reads vs how Adobe interprets raw images (by using the DNG converter and reading the tags - same data as in Lightroom/Photoshop). Reason is that I'm working on a DNG-converter using LibRaw and would like the results to be as close to Adobe's version as possible (rightly or wrongly).

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LibRaw 1.7beta1 vs dcraw 9.26 result

Submitted by xDreamer on

Hi,
I was trying to get the similar output to dcraw 9.26-x64 from LibRaw 1.7beta1-x64, but had no luck. Is it possible to get the exact 1:1 match to dcraw? It seems LibRaw is performing some sort of auto adjustment beyond "no_auto_bright", I tried "no_auto_scale" from my code too but it didn't help.

dcraw command:
"dcraw.exe" -v -w +M -n 10 -H 0 -o 1 -W -g 1.0 1.0 -q 3 -6 -4 -T "image.cr2"

dcraw_emu command:
"dcraw_emu.exe" -v -w +M -n 10 -H 0 -o 1 -W -g 1.0 1.0 -q 3 -6 -4 -T "image.cr2"

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optimisation/bug in convert_to_rgb() ?

Submitted by KevinJW on

I'm wondering if the code in dcraw_common in convert_to_rgb() is wrong...

#ifndef LIBRAW_LIBRARY_BUILD
raw_color |= colors == 1 || document_mode ||
output_color < 1 || output_color > 5;
#else
...

I thought it should be setting libraw_internal_data.internal_output_params.raw_color so that the convert_to_rgb_loop() function would not apply the matrix?

Also I wondered about adding an option to not compute the histogram in that function?

Thanks

Kevin

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Modify parameters of raw image

Submitted by hust_mark on

How can I modify parameters like "ISO speed","shutter ","timestamp".
For example : firstly, open a Raw file "test.CR2", then define LibRaw RawProcessor; i want to modify "shutter"of "test.CR2",my opinion is : RawProcessor.imagedata.other.shutter=8.9. But it does not work, the "test.CR2" file is not changed. how can i modify some parameters of RAW images.

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