LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Detect use of lossy compression in RAF

Submitted by sturm on

Is there a way to tell if a Fuji RAF file is using lossy compression? (Such as from the GFX-100 or X-T4.)

I get LIBRAW_IO_ERROR returned from unpack(), but I don't want to rely on that -- it could mean other things besides lossy compression. Ideally I'd like to check something in libraw_data_t that says what kind of compression it is, or even just a more general "not supported" indication.

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libraw 0.20.0 returns incorrect D65 multipliers and rgb_cam for ERBG file

Submitted by dsi on

Hi,
I noticed that for the Sony F828 that has an ERBG sensor, the Daylight white balance multipliers returned by 0.20.0 is 2.094020 0.917032 1.222377 0.000000. However, on 0.19.5, the values are 2.094020 0.917032 1.222377 1.203671.

Similarly rgb_cam on 0.20.0 is
1.6726 -0.5983 -0.0743 0
0.0080 1.4036 -0.4116 0
0.0046 -0.4089 1.4043 0

but on 0.19.5 it is
1.6374 -0.2528 -0.0035 -0.3811
0.0672 0.8224 -0.5306 0.6410
-0.0009 -0.3551 1.4153 -0.0593

Is this expected?

Regards,
Dinesh

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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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