Skip to main content
W
williamv3826206
Known Participant
April 24, 2023
Question

why are dng files produced bt denoise ai 6 times larger than the orignal

  • April 24, 2023
  • 3 replies
  • 2103 views

After using lightroom denoise AI the size of the Denoise generated dng file is 6 times larger than my original 20 mg OM-Systems ORF file. Is that standard workflow? Topaz photo AI produces dng that is 5 times larger than my original ORF file. Can anyone tell me why these files are so much larger than the original ORF raw files?

This topic has been closed for replies.

3 replies

TheDigitalDog
TheDigitalDog
Inspiring
April 24, 2023

If you want to dive deeper into the two correct answers about the whys:

http://www.barrypearson.co.uk/articles/dng/linear.htm

The bit depth is still high bit. 

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
Ian Lyons
Community Expert
Ian LyonsCommunity Expert
Community Expert
April 24, 2023

The Enhanced DNG file contains a demosaiced file, which is typically 3 times the original file size as it now contains RGB channels. Additionally, the Enhanced DNG file also contains a copy of the original mosaic data (i.e. a copy of the original raw file).

 

 

    L
    Lightboxx
    Inspiring
    June 13, 2023

    i have just started to look at the AI denoiser.

    i have some old DNG files that have lots of noise (small point and shoot camera).

     

    how can i access the original raw data in the DNG if i need to?

    if we have acess to that original data in the denoised DNG i could maybe delete the original DNG.

     

    i mean i see no way to get back to the original data once i have denoised the file.

    but that sure would be handy.

     

     

     

    D Fosse
    Community Expert
    D FosseCommunity Expert
    Community Expert
    June 13, 2023

    No, there's no way to get to the original mosaic raw data. So you can't delete the original file.

     

    There is in fact a copy of the mosaic data embedded in the Denoise file - but it's only there for future improvements in the algorithm. You can't extract it. I don't know why they made this decision, but that's how it is.

    D Fosse
    Community Expert
    D FosseCommunity Expert
    Community Expert
    April 24, 2023

    They are demosaiced. One grayscale channel is encoded into three RGB channels.

     

    It's also possible that the bit depth is higher (haven't checked that).

    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices