LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Unable to replicate image recived from command line in code

Submitted by spicer on

By using the example programs I can get the image I want by using the following
dcraw_emu -w -T

I want to be able to to this in a program so that I can do it in memory and not have to write it to the disk. To do this I wanted to replicate the draw_emu command line first, then change it to everything happening in memory.

But the code I have doesn't seem to use the camera white balance or output to TIFF.

int ret;
LibRaw libRaw;
#define OUT libRaw.imgdata.params

putenv("TZ=UTC");

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Unable to install libraw

Submitted by abk4523 on

My system:
fedora 25
Kernel 4.11.5-200
gcc gcc version 6.3.1 20161221 (Red Hat 6.3.1-1) (GCC)
LibRaw version 0.18.2

I am trying to install LibRaw but running into errors, the makefile always fails. See attached for details. According to this page, https://www.libraw.org/docs/Install-LibRaw.html, LibRaw has not been tested for gcc versions higher than 4.x. Am I trying to install an outdated version? And where can I get one more recent?

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CR2 to Tiff conversion produces darker image

Submitted by shawnathan007 on

I have a .CR2 image taken by a Canon 80D camera. I'm using LibRaw to convert it to a .TIF. The .TIF which is created is darker than the original .CR2 file (when viewed using Canon's Digital Photo Professional or Irfan View)

I read the contents of the .CR2 file to a buffer, then pass the buffer to this method to convert and save to .TIF:

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Output Color Options

Submitted by kennyc on

I'm using LibRaw in a macOS application for quickly showing thumbnails to a user of RAW files that aren't natively supported by macOS. It's working great, but I'm a bit confused by the documentation for:

dcraw_process

It says:

"The function is intended solely for demonstration and testing purposes; it is assumed that its source code will be used in most real applications as the reference material concerning the order of RAW data processing."

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LibRaw threading requirements.

Submitted by kennyc on

I'm attempting to use the LibRaw C++ API in a macOS Objective-C application. The LibRaw calls are being made inside an Objective-C++ file (.mm). However, I'm running into consistent crashes when attempting to use LibRaw on a background (non main) thread.

Simply declare a new LibRaw variable is enough to cause a crash: 

LibRaw processor;

However, if I first switch over to the main thread using GCD, then it doesn't crash.

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WB to Temp and Tint

Submitted by Explorus on

Hi.
I know, this question was asked more than once, but I still have not been able to find a solution.
I want to translate the white balance coefficients into Temperature and Tint, as for example, this is done in FastRawViewer.
For this, I used dng_temperature from the DNG SDK (about the error with the typing I know).
I receive rgb_cam from cam_xyz with cam_xyz_coeff for my camera. The rgb_cam now stores the matrix from the camera to sRGB.

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Saturation

Submitted by Explorus on

Greetings to all. I ask for help. Did I understand correctly that the user_sat parameter does not change the saturation, in the sense that the saturate in HSL, but indicates the maximum change? So I can't change the saturation? In what situations and how should I change the user_sat?
Thank you in advance

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libraw_dcraw_make_mem_image returns image with empty data size

Submitted by Torsten on

When I call the method libraw_dcraw_make_mem_image the return result is a valid image pointer, but the image->data_size is 0, as well as width + height.
The error code is 317061776, and the image is obviously invalid. The previous call to libraw_dcraw_process returns a status code of 0.

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