LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Read exif issue from panasonic raw file

Submitted by qdwang on

According to the https://exiftool.org/TagNames/Panasonic.html, the `AFPointPosition` tag id is 0x004d.

But it seems to the PanasonicRaw tags parsing is used in libraw.

Is it possible to access the 0x004d exif data form modern RW2 file without modifying the source code heavily?

Thanks for your great work.

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DigiKam Raw Conversion Output

Submitted by Tarek on

Recently I have stumbled upon DigiKam software which uses intenally Libraw library as a raw conversion engine.
I have tried to convert one of the images I have using DigiKam with all conversion settings disabled/set to default (i.e. gamma 1.0, no auto brightness, camera wb, no expsoure correction) and only I have an input a custom icc profile and output color space set to AdobeRGB. The output looks like this here (https://imgur.com/a/rJ3pS2b)

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LCMS and Libraw Support

Submitted by Tarek on

I have just compiled Libraw with enabling LCMS2 on Win10. From the generated executables it works just fine now and it can profile well. However, I am looking for using it as a dll library in my C++ code, so when I linked the compiled Libraw to my visual studio project I don't seem to be able to apply profiles, just like LCMS is not supported in the API.

Could you please point out if I am missing something? shouldn't Libraw API sees LCMS after compilation ?

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Phase One IIQ decoding

Submitted by t.sawka on

Hello

I'm trying to use LibRaw to decode Phase One IIQ images from two cameras: iXM-100 (not officially supported) and IQ280 (supported). I save results to .tif files and thumbnails to .pnm. I used all default settings.
Code I used:

https://drive.google.com/file/d/1PnbVb2J8jXkoGiOWqEa_n8A5X4-5zGTJ/view?u...

I also tried to use Open Image IO tool (which as I understand uses LibRaw as backend).

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I think the ACES color profile in libraw is incorrect

Submitted by bkv on

This is in reference to using dcraw_emu, though I imagine this could be an issue for libraw in general. I was comparing the output of photos developed with ACES to output with ProPhoto in a color managed photo viewer, and I noticed the colors just seemed a bit off, they looked warmer than I would expect. So, I extracted the ICC profile from the photo and took a look at the primaries, shown in the forward matrix below.

R G B
X 1.00600 0.01668 -0.05212
Y 0.36885 0.72124 -0.08864
Z -0.00362 0.01096 0.75758

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Sigma X3F support

Submitted by lanthale on

I have just did some testing with my Photoslide app and recognized that I cannot open X3F file. During my forum search I found out that this should be possible with the first 0.20.2.

Do I have to enable some special flags during building to enable the Sigma X3F support ?

Thank you in advance.

best regards,
Clemens

Now offical build of Photoslide is supported by libraw https://github.com/lanthale/PhotoSlide/releases/tag/v1.0.16

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Dependency for distriubtion

Submitted by lanthale on

Thanks to the help here I have now created the interface for Javafx (https://github.com/lanthale/LibRawFX).

Nevertheless I am asking which native libs must I package with the shared lib (libraw.dll / libraw.20.so / ...) so that libraw is working as expected and the user does not have on a standard system (libjasper ?, libjpeg ?).

I am not an C expert and therefore I do not know if the libs are only compile dependend libs or if those libs are needed for runtime as well ?

Thank you in advance.

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Image data does not match

Submitted by bsunisol on

Hi,
I'm trying to code a very simple raw developing tool. First I want to read and understand the data libraw provides.

But the data I get does not represent the colors in PhotoShop by any means. They are not off by a some digits, they seem to be completely different. The data I get is in the xls and the coresponding first 10x10 pixels from Photoshop. Unfortuantely the cr2 is too big to upload.

What am I missing here or where is the "useable" image data stored?

Thanks and regards from Germany
Rob.

Here's a my code so far:

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Access RGB values from libraw_processed_image_t

Submitted by lanthale on

I am under way to build libraw support for another media management system called Photoslide (github.com/lanthale/photoslide) and wanted to add libraw support.

Using java and the foreign memory api I can access libraw without any issues.

Nevertheless I am facing the issue how I can access the rgb (rgba) values of the in memory image because I do not want to write first a tiff file and then read the pixels again from the temp file.

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