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E
EduP
Participant
October 11, 2023
Answered

Artifacts with super resolution on lossy compressed DNG with cr16

  • October 11, 2023
  • 1 reply
  • 2970 views

Hi there,

I'm currently testing the new lossy compression feature in Camera Raw 16, and I'm finding the file size reduction to be quite impressive! However, I've noticed some unusual artifacts when using super resolution on a lossy compressed file, which I'm not observing with a CR15 lossy compressed file. I'd like to know if this is a tradeoff of the file size reduction or if it's a bug.

Thanks,

Edu

 

This topic has been closed for replies.
Correct answer MadManChan2000

Apologies for the user change; I was using another computer. After conducting more tests with the compression scheme, it seems clear to me that it's dialed up to eleven. All the noise texture is lost, and there are artifacts everywhere. In my opinion, the old compression was much more balanced. Would it be possible to have control over the DNG compression scheme and revert to the old one? 

Thanks, 

Edu

p.s. I can send the original files if anyone is interested.


Understood.  We're going to have some more options in the next release of Camera Raw that will enable you to achieve better quality, with lossy.

 

The current lossy compression DNG settings available in ACR 16.0 were intended with Smart Preview (proxy) workflows in mind; that is, as a temporary stand-in for the original..

 

Stay tuned for some improvements in this area.

1 reply

MadManChan2000
Adobe Employee
MadManChan2000
Adobe Employee
October 11, 2023

Can you explain the workflow (steps) you followed to produce the image on the right?

Is your original file a raw file or something else?

E
EduPAuthor
Participant
October 11, 2023

I adjusted the original NEF using Camera Raw 16, and then converted it to lossless and lossy DNG formats in Camera Raw 16. I processed the lossy DNG (CR15) with DNG Converter 15.2, and finally, I applied super resolution to all three files in Camera Raw 16. I'm sending you the files in a private message.

Thanks!

deejjjaaaa
deejjjaaaa
Inspiring
October 18, 2023

The following is a draft of the updated DNG Converter command line documentation that we'll post on the official site before too long.  Not all the options are available yet (esp. -lossyMosaicJXL and -losslessJXL), but the other JPEG XL related compression settings do work.  There are many examples that I've added to the docs for typical use cases.  For example, for high quality lossy, try:  -dng1.7 -lossy -jxl_effort 7 -jxl_distance 0.1 [input file]

 

As an example for a source non-DNG Bayer file that is lossless compressed using the native format.

Original: 45 MB

Convert to DNG (lossless JPEG, prior to 1.7): 38 MB

Convert to DNG (lossy JPEG XL, effort 7, distance 0.1): 16.4 MB

Convert to DNG (lossy JPEG XL, effort 7, distance 0.2): 9.9 MB

Convert to DNG (lossy JPEG XL, effort 7, distance 0.3): 7.2 MB


there is a small typo in PDF  in examples part :

"Convert a mosaic raw file to a linear RGB DNG (demosaiced) with lossless JPEG compression:
EXE -linear DSC0001.NEF"

shall be "-l", not "-linear" 

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