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Reply to: Where is RAW Image data stored and datatype   4 months 2 weeks ago

Sorry, know nothing about VB.NET

In C/C++ libraw/libraw.h is enough, all needed files will be included automatically via #include directives in libraw.h

Reply to: Where is RAW Image data stored and datatype   4 months 2 weeks ago

Hi Lexa

I have made some progress in VB.NET to get camera sensor data from "libraw.dll".
For example, I see image size data but all values in "libraw_rawdata_t" are 0 or Nothing, including pointer "raw_image". So therefore I don't see any pixel data.

Recall that I am only executing "libraw_init" , "libraw_open_file" and "libraw_unpack" as I only want to get the raw unprocessed data from the camera sensor.

I am not asking about how to use VB.NET, but whether I have included all typedefs from libraw_types.h.

I have created in VB.NET all the data structures that are defined in "libraw_data_t" (from "libraw_types.h").
I have also included all nested data structures that are referenced by those data structures in "libraw_data_t".

My question is: Are there any other data structures that I have to include from other C or C++ files to get the raw unprocessed data from the camera sensor? For example, in "unprocessed_raw.cpp", will I need to include data structures defined in "#include "libraw/libraw.h"?

Reply to: Generating ColorMatrix1 from input data   4 months 2 weeks ago

Apart from what Alex said, good colour can't be solved with a set of 3 by 3 matrices.

Reply to: LibRaw for Windows 32 bit?   4 months 2 weeks ago

Hi Alex,
thanks a lot for the fast response. Good to hear, that I can proceed with 32-bit. I am also surprised that there still seems to be the need for it.
My LibRaw is older. I started with https://github.com/hurlbertvisionlab/LibRawWrapper.git which includes LibRaw and is from July 2021. Will update the local copy of LibRaw with latest version from https://github.com/LibRaw/LibRaw.git and will let you know about the result.
Link to sample file is sent to info@libraw.org.

Norbert

Reply to: LibRaw for Windows 32 bit?   4 months 2 weeks ago

Could you please provide the sample file that is handled wrong in 32-bit mode? Use info@libraw.org for that :)

On Nov 26, 2021 we fixed one 32-bit related error via this commit: https://github.com/LibRaw/LibRaw/commit/30595a731f3bea78f0410426b73ef3af...
Probably it will fix the issue but we need sample file to be sure.

If your LibRaw is older consider upgrade via github (or just apply this patch)

The easiest way to build 32-bit LibRaw for windows is
1) start Visual Studio developer shell in 32 bit mode
(e.g: run cmd.exe and execute
call "C:\Program Files ... path to VisualStudio installation...\VC\vcvarsall.bat" x86
)
2) run nmake -f Makefile.msvc to build LibRaw

32-bit windows (and even more broadly, 32-bit apps) don't look relevant in 2022, nevertheless, it is still too early to completely stop 32-bit systems support.

Reply to: Generating ColorMatrix1 from input data   4 months 2 weeks ago

LibRaw's main goal is RAW data extraction (plus metadata needed for RAW processing).

RAW conversion is very basic and no plans to improve it (or even touch it).

Generally speaking, raw color data is also out of LibRaw's scope (unless contained in RAW metadata), although we provide some basic data enough for basic processing.

Reply to: Generating ColorMatrix1 from input data   4 months 2 weeks ago

I think for me the real question is why libraw only uses one color matrix? Why not use two like DNG 1.5 and before or even three like DNG 1.6?

Reply to: Generating ColorMatrix1 from input data   4 months 2 weeks ago

I just put the cam_xyz into ColorMatrix1 and set the illuminant1 to D65.

The DNG output color is slightly off but acceptable.

I'm not sure if libraw can do this. Take the PixelShift2DNG application as an example, that one is built around libraw but only supports a few cameras, the ColorMatrix1 field can be easily copied from Adobe DNG Converter results.

Well, that's one possible solution, convert the images using Adobe DNG Converter first, then you have it.

Reply to: Nikon Z9   4 months 3 weeks ago

According to Update Policy section at this site homepage: https://www.libraw.org/

Reply to: Nikon Z9   4 months 3 weeks ago

Thanks. Do you have a timeframe for this snapshot release?

Reply to: Panasonic Lumix DC GH6 raw RW2 support   4 months 3 weeks ago

I tried to inspect a bit more the situation:

rawtherapee which uses some custom dcraw success in extracting the compressed raw data,
but it fails in decoding the decompressed structure.
I modified it to dump the uncompressed raw (which display as garbage currently).

For a 25 mb pixels image, there is exactly 50 mbytes of decoded data being decoded.
which correspond to 2 bytes per pixel, which seems to be confirming the 16 bits per pixel.

I tried making a black frame and a white frame,
just to see if I could understand something, but the result are not that great:

The first bytes of the frames are looking like that:

white frame:

00000000: dfce f87f 7b8c ffdb d77c 9d99 7c14 29bd  ....{....|..|.).
00000010: 91a7 d027 0405 22d3 147d 3371 f16b 0b07  ...'.."..}3q.k..

black frame:

00000000: 1ba4 1b9c 1b80 1bb0 b707 f8d9 cdf8 12fa  ................
00000010: f71f 4e32 e6ad f321 9dff d53f 2731 ead1  ..N2...!...?'1..

So...
either they are crypted or salted,
either the colorspace is uncommon,
either I am missing something, which can be possible as I am far from an expert in this domain.

The data are there : (including the two RW2 files)

http://esby.free.fr/perso/GH6-RW2/

See
http://esby.free.fr/perso/GH6-RW2/P1000404-black.info
and
http://esby.free.fr/perso/GH6-RW2/P1000407-white.info

for the filesizes and basic descriptions

(the dng were producted by Adobe Dngconverter 14_3 under wine staging 7.2 )

Reply to: Panasonic Lumix DC GH6 raw RW2 support   4 months 3 weeks ago

In the meantime conversion with the most recent Adobe DNG Converter works.

Reply to: Panasonic Lumix DC GH6 raw RW2 support   4 months 4 weeks ago

Most likely not

Reply to: Panasonic Lumix DC GH6 raw RW2 support   4 months 4 weeks ago

Will GH6 raw format supported in the next release/snapshot?
Regards
Ugo

Reply to: Nikon Z9   4 months 4 weeks ago

Nikon Z9/standard compression support will be published in next snapshot or release (whatever comes first)

Reply to: Where is RAW Image data stored and datatype   4 months 4 weeks ago

Thanks. This gives me the confidence that I am looking at the correct data structure.

I have looked at unprocessed_raw.cpp, but it is slow going for me, not being a C or C++ developer, but I will keep at it.

I now have the confidence that I should be able to solve my issue in VB.NET.

Will keep you posted.

SteveR

Reply to: Where is RAW Image data stored and datatype   5 months 10 hours ago

Dear SteveR:

Quoting from datastructures API (https://www.libraw.org/docs/API-datastruct-eng.html#libraw_rawdata_t already quoted above):

unsigned short *raw_image;
Pointer to buffer with one-component (bayer) data.

Have you looked at the source code of the unprocessed_raw.cpp (also quoted above)?

Reply to: Where is RAW Image data stored and datatype   5 months 10 hours ago

Thanks. However, I don't believe I can create an instance in VB.NET of imgdata to be able to access the raw_image array

I can access the various data structures in VB.NET, as listed previously.

Does one of the data structures contain the RAW values from the sensor pixels?

Reply to: Where is RAW Image data stored and datatype   5 months 12 hours ago

libraw_rawdata_t is described in documentation: https://www.libraw.org/docs/API-datastruct-eng.html#libraw_rawdata_t

samples/unprocessed_raw.cpp code sample shows how to use imgdata.rawdata.raw_image array (other cases: 3/4 color images, float images are not covered by this sample)

Sorry, know nothing about VB.NET, so I don't know what your problems might be

Reply to: Panasonic Lumix DC GH6 raw RW2 support   5 months 1 day ago

Yes, this is completely new encoding format, nothing common with previous panasonic formats.

Reply to: New camera support   5 months 1 week ago

The profile created is very close to sRGB profile (default tone curve is slightly different).

So, if the problem still exists: please make sure
a) you use real updated LibRaw, not outdated .dll or .so/.dylib somewhere in the shared library path
b) you have recompiled your application too: offsets in LibRaw object may change resulting in unexpected things

Reply to: New camera support   5 months 1 week ago

The approach via dcraw_emu works.

But is there any way to use:
libraw_processed_image_t *image = RawProcessor->dcraw_make_mem_image(&ret);
and to get the color profile which is embedded by dcraw_emu into the TIFF?

Thorsten

Reply to: New camera support   5 months 1 week ago

Here is your file processed with dcraw_emu -w -T: https://www.dropbox.com/s/z14eycj4932v47s/original.orf.tiff?dl=0
I do not see anything that bad here.

dcraw_emu was just built from LibRaw github/master

Please try to repeat the problem with LibRaw's dcraw_emu (-w -T), if it is not reproduce: the problem is in your code.

Reply to: New camera support   5 months 1 week ago

I tried the latest patch.
It imports the ORF file. But the colors are really terrible with the default settings. Do you suggest any special settings?
Original file: https://www.lemkesoft.org/temp/original.orf
Imported file: https://www.lemkesoft.org/temp/import_25percent.png

Thorsten

Reply to: DNG recorder   5 months 2 weeks ago

Just use Adobe DNG SDK:
- it is free
- it is BSD licensed
- it is capable to record industry-standard RAW files compatible with ANY raw-processing software.

(the only problem is lack of useable documentation but it is easy to grab a working sample code from github :)

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