LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Support for Canon EOS 80D RAWs

Submitted by mka on

I recently got a Canon EOS 80D, the model was released about two month ago. I use digikam (v4.14.0) for post-processing, which uses LibRaw (v0.17.1) for RAW decoding. The decoded .CR2 files from the 80D are very "hazy", with low contrast and a blueish cast.

I attached a JPEG (just RAW decoding + highlights raised) to this post, the corresponding RAW file can be found at https://drive.google.com/file/d/0B-fwGolScP68dzRTek9oYXY1M28/view?usp=sh...

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LibRaw 18.0 with LCMS2 and Libjpeg-turbo.

Submitted by KaroTK on

Hi again,

I was reading this http://www.linuxfromscratch.org/blfs/view/svn/general/libraw.html article and I saw that these libraries are *optional* I am trying to build a version of LibRaw that has support (is linked to) LCMS and Libjpeg Turbo.

So I went ahead and built everything LCMS and libjpeg the way I want. Now I am doing the following

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Extracting small resolution jpeg and GPS data from RAW files.

Submitted by KaroTK on

Hi,

I know that some RAW formats store a small resolution JPEG image for quick preview that is different from a thumbnail. I manage to extract that using third party software such as ExifTool, how is it possible to extract that using LibRaw? Also in the changelog I see that you have added an option for GPS data extraction, but when I try that i.e.

open the file and read the data from imgdata.other.gpsdata it always returns nothing. Is there anything else I should do for after open_file(fileName) to load the needed information?

And the same question for xmpData.

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Fuji X-E2 Firmware 4.0

Submitted by netgeek on

LibRaw used to support Fuji X-E2 raw files. But with the recent camera update to firmware 4.0, the raw file format seems to have changed and LibRaw is not able to read it. Here is the output from simple_dcraw and dcraw_emu. Both were compiled from the latest 0.18 source:

>simple_dcraw.exe Black.RAF
Black.RAF: Unexpected end of file
Cannot unpack Black.RAF: Input/output error

>dcraw_emu.exe -v "Black.RAF"
Processing file Black.RAF
Black.RAF: Unexpected end of file
Cannot unpack Black.RAF: Input/output error

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dcraw_process XYZ output

Submitted by Sylvain on

Hi.

I'm trying different values for imgdata.params.output_color.
I took a test picture where all channels did clip, and use cam_mul.

Using in imgdata.params.output_color=1 (sRGB), I get as average R=1, G=1, B=1 (*65535).
This is exactly what I expected since all the channels have clipped: I get D65 white. :)

Now I try imgdata.params.output_color=5 (XYZ).
I was expecting to get D65 white, which is (normalized to Y=1):
X=0.95, Y=1, Z=1.09.

I get
X=0.95, Y=1, Z=1 (*65535).

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error while loading shared libraries: libraw.so.15: cannot open shared object file

Submitted by aashay_mittal on

I've installed libRaw and am compiling the sample .cpp file provided by this command (seen from another discussion):
>> g++ libRaw.cpp -o q -lraw -lm
However, when i run the file,
>> ./q
I get the following error:
./q: error while loading shared libraries: libraw.so.15: cannot open shared object file: No such file or directory

As far as I know, I think this is a linkage problem, however, the path provided in the 'libraw.la' file for 'libraw.so.15' is correctly specified under libdir='/usr/local/lib'.

Please help :)

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I would like to know a bit more about RawSpeed

Submitted by asdiele on

Hello!

We are currently using LibRaw, but I would like to know know if it will be worth, and safe, to include RawSpeed in our build of LibRaw.

- Is it stable for the formats that are selected to use RawSpeed?
- Does it fall back to a slower, stable method for those formats that are not selected to use RawSpeed?
- On average, what is roughly the expected speed up of using RawSpeed?

Thanks!
Asdiel

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