LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Differences in libraw behaviour between 0.19.5 and 0.20

Submitted by dsi on

Hi,
I recently upgraded from 0.19.5 to 0.20.0 and I noticed the difference in rendered sRGB output for many camera phone shot DNG files. I also noticed differences in the rgb_cam, cam_xyz and pre_mul values returned. I wanted to confirm if this is indeed intentional or a bug.

You can find a DNG file and the accompanying sRGB PNG files at this location below:
https://drive.google.com/drive/folders/1XiixDdUnsPY2TKcN-DzshNX2EmnA-EDY...

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Using unprocessed_raw in Mac

Submitted by han.k on

I tried to use the compiled unprocessed_raw in the Mac but it it requesting for libSystem.B.dylib. See attached. I can't find that file.

Is it possible to run unprocessed_raw without installation? The intention is to include unprocessed_raw in my application app. So best option would be to have required libraries, dll included in a single executable file.

Han

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Finding the bayer pattern for Canon T2i (550D)

Submitted by mcintyre_sj on

I am using libraw for a CR2toFits conversion program i wrote. It extracts either a raw CFA image or a debayered RGB colour image and creates a FITs file. And since it's just for me, it only handles the Canon T2i CR2 files. I had been using libraw v0.19.2 but just upgraded to libraw v0.20.0.

I use librawFile.unpack() to load the raw data.
Then access the raw data use librawFile.imgdata.rawdata.raw_image[b] to read the sensor pixel values.

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raw-identify bug when displaying Camera2RGB matrix for Sony DSC-F828

Submitted by dsi on

This camera produces a RAW file that has a REGB layout which means there are 4 colors. This results in a non-square rgb_cam. However, the display code in raw-identify (v 0.19.6) appears to be incorrect. The code is as below:

for (int i = 0; i < P1.colors; i++)
printf("%6.4f\t%6.4f\t%6.4f\n", C.rgb_cam[i][0], C.rgb_cam[i][1], C.rgb_cam[i][2]);

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Pink Clouds with LibRaw 0.20.0

Submitted by olokobayusuf on

Hi all.

I'm getting pink clouds when trying to convert a RAW to a TIF/JPEG with LibRaw 0.20.0. I've run into this a while ago in fact, when using the RawPy wrapper library for Python.

Here's the RAW file in question, along with the TIF I get from LibRaw. I'm running the following:

./dcraw_emu -H 0 -o 1 -W -q 3 -w -T -g 1 1 -c 0.75 4.CR2

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Issue on some camera

Submitted by lock on

Hello everyone.
First thank you for your big work on this lib I used for my software.
Since the last version I have issues with some camera (especially canon). This is probably due to a big change you've done.

As stated in Changelog:
* Bayer images: ensure that even margins have the same COLOR() for both the active sensor area and the full sensor area.

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LibRaw::open_file() never returns

Submitted by David Partridge on

I've been sent some CR3 files that were reported as causing my application to freeze.

The problem appears to be that open_file() never returns and just sits there eating CPU.

These same files also cause Windows Explorer to freeze for a number of seconds and then Explorer closes and restarts (maybe they're using LibRaw internally to the raw file codec).

I've placed a zip file containing the bad files on Dropbox:

https://www.dropbox.com/s/oph39pbicm5jxjb/Bad.zip?dl=1

Thanks
David

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CR3 and 16 bit support

Submitted by merope on

Hi,

I am trying to convert CR3 images to 16 bit fits files used RAW2FITS, which uses libraw. I have the newest libraw installed, which supports cr3.

When converting to 8 bit images, everything looks fine. However, when setting the output_bps to 16 everything is garbled, at the libraw level. First of all, pixel values are all still 8 bit (max values of 255) and their coordinates are wrong also.

Any help is appreciated.

-Merope

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libraw errors with DNG files processed by Adobe LightRoom

Submitted by dsi on

Hi team,
I have a couple of DNG files that were created in Adobe LightRoom. You can find them here:

https://drive.google.com/drive/folders/1mxxENtJ6P51ksR6choAGbUSud451lNJX...

They fail when calling unpack() with the error "Corrupted data or unexpected EOF". Call to open_file works. Hence raw-identify is able to parse metadata from the file.

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