LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

What can cause different output inside Docker container?

Submitted by dmitri on

Hello,

I'm executing `dcraw_emu` inside a Docker container that uses `node:23-alpine` and the latest version of LibRaw.

When I run LibRaw to convert a DNG file inside the container running locally, I get good results. However, when the container is running on Digital Ocean, my results look very different: there's a lot of data lost in the output TIFF file that causes the result to look way too bright.

This happens only to a specific DNG file that comes from a scanner operated by SilverFast software. Other DNG files work fine and look the same on both systems.

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Unknown error code (0x16) returned by libraw_dcraw_process()

Submitted by marekp on

Having correctly unpacked my raw image into raw_image, I tried to use libraw_dcraw_process() to create a debayered image with params.half_size = 1 (as per sample code), but I get a return code 22 (0x16) which libraw_strerror converts to "Unknown error code". Any hints as to what might be wrong?

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JNA wrappers for LibRaw

Submitted by marekp on

I'm trying to write some JNA wrappers for LibRaw, but I'm struggling with the JNA spell for the raw data, specifically for the *raw_image member of the libraw_rawdata_t structure. I can access other members of this and other related structure as expected, but assuming that I would need to use a JNA Pointer type for *raw_image, I only ever get a null for this member after an unpack (no errors) call. I assume libraw.dlI allocates the memory for this data and return a pointer to a short array.

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I don't understand why I get only 2 components data in all pixels

Submitted by pedropark99 on

I tried to find some topic that already exists, and describes this problem, but I did not find one. Therefore, I decided to create this topic to seek help. I have a CR2 raw file, and I just want to get the raw pixel values, without "demosaic". Here is my source code so far:

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Version Marking for 202403 Snapshot

Submitted by andrewj on

Please could someone confirm the LibRaw version marking which should be displayed by an application using the 202403 snapshot?

I confess to being confused by LibRaw versioning. According to https://www.libraw.org/ "Minor updates (0.20.1, 0.20.2…) do not change the API/ABI and new cameras are not added; generally they are just bugfixes." Therefore I would expect 21.3 to just be a bugfix on 21.0.

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RAW Processing Theory Resources (highlight recovery especially)

Submitted by blairconner on

First, I solemnly swear I'm not expecting LibRaw to process my RAW data! I am trying to do my own RAW processing and LibRaw has wonderfully extracting the RAW data for me :)

I also recognize this forum isn't for RAW processing techniques, but there are many experienced people here so I'm hoping you all can point me to some resources that I can educate myself regarding the topic. I'm specifically interested to learn about different highlight recovery techniques.

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Sony YCbCr white balance difference seems off

Submitted by joostn on

Hi,

I have a question regarding these two images:

https://drive.google.com/file/d/1FZDh3jiw-85sJy3qJUh-xL4E5fA1mEfV/view?u...
https://drive.google.com/file/d/1GWI7D2sY2VcZrlFASAzkSklQl7vJ0qYn/view?u...

These are Sony YCbCr images, shot at the same camera white balance. I see they have

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Steps for building dcraw_emu with USE_DNGSDK

Submitted by mikamikem on

Hello!

I'm trying to build dcraw_emu with the DNG SDK support enabled and I can't figure out how to get the DNG SDK to generate static or dynamic libs to link against. I saw the commented out lines to enable DNG SDK Support in Makefile.dist, but when I build dngvalidate, it just builds the executable and doesn't populate libs into a release folder like the makefile is expecting.

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