DNG 1.7 (Camera RAW 16) / JPEG XL / lossy support

[Kadet]

I wonder if this Libraw release brings the support. It is pre release though.

https://www.libraw.org/news/libraw-022-prerc1

Now is release:
https://github.com/LibRaw/LibRaw/releases/tag/0.22.0

[mgear]

Thanks, but currently always in development, not in release

First of all, thank you for all your incredible work on XnView! It's an indispensable tool for so many of us.

I'd also like to express my interest in support for Lossy DNG 1.7 (JXL) files. I understand this often depends on updates to external libraries like libraw, which can sometimes take a while.

With that in mind, I was looking into it and thought I'd share a potential alternative, just in case it's helpful. The official Adobe DNG SDK provides a high-level dng_render class that handles the entire decoding process. It returns a dng_image object, which gives direct access to the final RGB pixel array. A good working example of this can be found in the dng_validate tool that ships with the SDK.

Of course, this is just a thought, and I completely understand you have your own roadmap and priorities.

Thank you again for considering it and for all your amazing work!

[xnview]

0.22.0 not yet released

[Kadet]

Now is released:
https://www.libraw.org/news/libraw-0-22-0-release

[mgear]

Now is released:
https://www.libraw.org/news/libraw-0-22-0-release

DNG 1.7 (including JPEG-XL compression) support via Adobe DNG SDK 1.7.x integration
...
JPEG-XL previews (DNG 1.7) support

hurray!

[golemus]

0.22.0 not yet released

Seems to be now in latest version.

Has anybody been able to view DNG 1.7 lossy JXL images? For me it appears as it is still not working, it still just shows the smallest JPG preview (which is typically maybe 200-300 pixels wide). I tried also modifying settings - read - camera raw, embedded preview, half size, full size,, ignore read errors but they didn't seem to affect.

Below is link to sample DNG files if Pierre wants to check them out.

https://nx76363.your-storageshare.de/s/MZiAbKDsda9bRK3

[golemus]

I downloaded libraw 0.22.0 and tried to convert to tiff with dcraw and it said 'unsupported format'.

So there is chance that problem is at libraw:s end.

But I never used before bare libraw so take my word with grain of salt.

[golemus]

This is what libraw answered to my post in github:

>The full note text is: DNG 1.7 (including JPEG-XL compression) support via Adobe DNG SDK 1.7.x integration
>Please build LibRaw with Adobe DNG SDK 1.7 and 1.7.1 and do not forget to use set_dng_host() in your code.
>See details in these issues: #716 and #723

Is it built with Adobe SDK in xnview MP...?

[golemus]

Problem seems to remain with version 10.1.3 which came out today.

[golemus]

Is there any near term plan to add this?

Or would it bring some issues or complexities to have the libraw version where parts include or are made with Adobe SDK...?

[golemus]

.

Hi Pierre. If/when you build LibRaw with JXL support in this Github topic there is info which might be helpful to make it work properly.

https://github.com/LibRaw/LibRaw/issues/786

[xnview]

New version will have jxl decoding

[golemus]

sounds excellent.