Recent comments

Reply to: I think the ACES color profile in libraw is incorrect   1 week 6 days ago

There's other huge gamuts too, like xTremeRGB , MaxRGB, and AllColorsRGB. None of these are in libraw, but the description of xtremeRGB says that, "CAUTION: XtremeRGB may cause hallucinations or eye cancer." (http://www.hutchcolor.com/profiles.html)

Reply to: I think the ACES color profile in libraw is incorrect   1 week 6 days ago

I realize that, just thinking out loud pragmatically 😉

I guess there are ProPhoto and Rec2020 outputs available to cover a "similar" range and precision...

Reply to: I think the ACES color profile in libraw is incorrect   1 week 6 days ago

LibRaw is limited to whatever raw data is. Processing of raw data (white balance, colour space conversion, gamma) is out of the scope of main LibRaw functionality, we keep such processing for testing purposes only. LibRaw is not a raw converter and isn't meant to be one ;)

Reply to: I think the ACES color profile in libraw is incorrect   1 week 6 days ago

Btw, I'm wondering how useful (or harmful?) is it to have that huge ACES AP0 output color space when LibRaw is limited to uint16 representation...

Sounds like an AP1-based ACEScg D65 adapted option would be good to have as well?

One should perhaps clarify in the docs that AP0 based "ACES2065-1 adapted to D65" is meant by the existing "ACES" enum?

Reply to: I think the ACES color profile in libraw is incorrect   2 weeks 20 hours ago

> My apologies if I offended or annoyed you.
Not in the least.

> I was under the mistaken impression that the ICC profiles are simply assigned on output
They are not, but even if they were, what good is it to assign one profile while converting to a different one?

I checked, and yes, Coffin's aces_rgb matrix isn't adapted to D65.

Fixed in master now (the changes are in src/tables/colorconst.cpp) https://github.com/LibRaw/LibRaw/commit/1974214acf47ef260853d74006765746...

Reply to: I think the ACES color profile in libraw is incorrect   2 weeks 21 hours ago

My apologies if I offended or annoyed you. I was under the mistaken impression that the ICC profiles are simply assigned on output

Reply to: I think the ACES color profile in libraw is incorrect   2 weeks 23 hours ago

I think I made it clear what I'm referring to, and so did you. We can't fix what is not there. Your proposal is technically impossible (and in any case, the starting point is the matrix in the standard), and I explained what we are going to do. Let's return to the topic only when there will be anything new to discuss.

Reply to: I think the ACES color profile in libraw is incorrect   2 weeks 23 hours ago

To which matrices are you referring? The cam2rgb matrices? I am talking about what's in the actual icc profiles embedded in the images, to be clear.

Reply to: I think the ACES color profile in libraw is incorrect   2 weeks 23 hours ago

I'm saying that matrices in Coffin's workflow are of a different nature (his workflow doesn't use "forward matrix for ACES", or "ACES colour profile", so no place to change it), and that we will check aces_rgb matrix to see if the chromatic adaptation from ACES "D60-like" white point to D65 necessary for Coffin's workflow is missing.

Reply to: I think the ACES color profile in libraw is incorrect   2 weeks 1 day ago
Re

I checked the ProPhoto and sRGB XYZ values, and when arranged in a matrix the rows sum to the expected D50 values. The ACES one was the only one that was abberant.

The D65 part comes in the MediaWhitePoint tag in the ICC profiles. There's no issue with that, I'm aware of that aspect of Coffin's color profiles and they have correct values in the MediaWhitePoint tag.

The XYZ values in the ICC profile which form the RGB to XYZ matrix ('forward matrix') though should sum to the connection space illuminant however, which is D50 regardless of the media white point. This is because these values take it from the connection space, which is CIE D50 2 degree observer XYZ space, to RGB, and chromatic adaptation to the media white point is done from there. See section 6.3.4.3 of https://www.color.org/specification/ICC1v43_2010-12.pdf

In any case, the sums of the XYZ values found in the ACES profile I extracted are 0.97056 1.00145 0.76492 respectively. Looks like it's almost the correct set of values, but somewhere along the way there was probably a typo. I'm not sure if this is exclusive to libraw or if this was also present in the original dcraw since I don't have the original dcraw currently.

Thanks for getting back to me!

Reply to: I think the ACES color profile in libraw is incorrect   2 weeks 1 day ago

> Note that even if the white point is D65 or D60, the rows of the forward matrix should sum to the D50 values.

Not in Coffin's workflow, he uses D65 to avoid an extra step of chromatic adaptation (check his ProPhoto RGB, for example).

Also, aces_rgb[3][3] is not a forward matrix, it's sRGB to ACES matrix (see identity matrix rgb_rgb[3][3] for sRGB).

We will check the aces_rgb matrix to make sure it follows the same logic as other matrices.

Reply to: Bayer moire   3 weeks 3 days ago

Seems ECW Demosaicing looks similar to the one Capture One uses 2021.

Reply to: How to create syntethic mosaic images   3 weeks 5 days ago

Without coding, just using a simple script with calls to: dcraw.exe, exitfool and dng_validate from Adobe, I have managed to create some synthetic valid DNG files:
- Linear light decomposition to balance different colour temperatures in RAW
- Mean stacking to mimic ultra low ISO/ND filter
- Median stacking to remove moving subjects
- HDR RAW

https://www.overfitting.net/2021/04/generando-un-raw-en-formato-dng-part...

Regards

Reply to: Alexa LF Plus W support?   1 month 1 week ago

Thank you. Now I use command line tool to decode. Alexa LF plus W is the camera of the ARI file that I exported with other software.

Reply to: How to create syntethic mosaic images   1 month 1 week ago

We use Adobe DNG SDK to create DNG.

Reply to: Alexa LF Plus W support?   1 month 1 week ago

Last LibRaw public snapshot supports some Arri models if compiled with LIBRAW_OLD_VIDEO_SUPPORT defined. Not sure that LibRaw support this specific camera (Alexa LF listed as supported, do not know what is pus W)

We plan to continue Arri support up to release 0.21, than drop this support: LibRaw is not about video.

Please consider use of other API (e.g. Arri SDK)

Reply to: Alexa LF Plus W support?   1 month 1 week ago

I need help

Reply to: CRAW Canon EOS R5   1 month 1 week ago

Thanks a lot for the work. 🙏🙏

Reply to: CRAW Canon EOS R5   1 month 2 weeks ago

Hello! any news on this? thanks!

Reply to: LibRaw 0.20 supported cameras   1 month 3 weeks ago

Dear Sir:

Please advise the author of the program in question to check https://www.libraw.org/blog and to use the current LibRaw version.

Reply to: LibRaw 0.20 supported cameras   1 month 3 weeks ago

I Have a question about .cr3 format by canon.

When I add .cr3 files and start stacking the program is not creating stacked file.

Could you help me with this issue?

Thanks!

Reply to: Canon R5 CR3 Support?   2 months 3 days ago

right you are, now that is shameful.
Yeah, I barely ever develop/compile any code on windows. I wouldn't try and use 'rm' in the Win CMD but I thought the Makefile.MinGW will be fully Win-compatible.... I guess not, didn't think straight, this lack of movement due to COVID is eating away on my braincells.

Good find and lazy me, great community here!

Reply to: Canon R5 CR3 Support?   2 months 3 days ago

You are running mingw32-make from cmd.exe shell, and rm command does not exist in DOS. Even if you have the MSYS bin directory in your PATH where MSYS rm.exe lives, its behavior is probably strange/undefined under cmd.exe...

I prefer to use the MINGW (bash) shell from the start menu and traditional make (installed under MSYS) instead of ming32-make, the behavior is much more consistent with all other *nix platforms and build scripts.

Reply to: Canon R5 CR3 Support?   2 months 5 days ago

right... so I removed line 134: rm -f lib/libraw.a
from the Makefile.mingw and it finished as expected. Not sure why the rm throws an error. Running it again throws no error even with the rm sinc the 'lib/libraw.a' then exists. Windows... :-/

thanks for the help. Now I'm working on windows defender accepting the compiled *.exe and NOT starting thread alerts everytime they run. Only happens to compiled ones. I'll get it done.

thanks again. Any usage questions I'll post elsewhere.

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