Large DNG-files in LR 12.3

Forum|Forum|2 years ago
April 25, 2023
返信数 5.
3269 ビュー

The resulting DNG-files in LR 12.3 AI Denoise are exceptionally large. Although claimed that the files should be smaller than the original RAW files (Oly = ORF) they are a multiple of it (90 mb against 20 mb). I expected the file-handling settings to affect the file size, but this isn't the case. Further on the image-size isn't displayed correctly in win-explorer (the size of the jpeg preview thumbnail 1024x768 is displayed.)

Below listed are all files generated with the 12 variations of the file-handling settings. No effect is visible.

Windows

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解決に役立った回答 Gerard Keet

One would expect larger files because of the extended information. I wondered why Adobe claims smaller files. The 'wrong' image dimensions in Win11 are changed into the 'right' by applying Metadata>Update DNG Preview & Metadata.

J

johns85809398

Participant

While the newly created DNG file from Denoise is large, you can convert this file to a new DNG with lossy compression. (Under the "Library" menu, select "Convert Photo to DNG". This results in another DNG file that's ~10% the size of the Denoised DNG You will then need to delete the Denoised DNG from the disk - it's automatically removed from Lightroom, but the actual file is still present. You can 1)open the folder in MacOS Finder or Windows Explorer and delete. 2) Import the the folder back into lightroom and then delete the imported picture - this way works well if you have files in many folders; you can also clean up files that you removed from the catalog, but didn't delete as well)

Ian Lyons

Community Expert

Lossy DNG Files are 8 bit. So, not the best option if highest quality files are required.

JohanElzenga

Community Expert

The quoted pixel dimentions of the DNG suggests that Windows is showing you the size of the preview, not of the actual DNG.

-- Johan W. Elzenga

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Gerard Keet作成者

Inspiring

That's right Johan, see my earlier answer/post on this. You can check the file content with the free software Exif Pilot.

G

Gerard Keet作成者解決！

Inspiring

One would expect larger files because of the extended information. I wondered why Adobe claims smaller files. The 'wrong' image dimensions in Win11 are changed into the 'right' by applying Metadata>Update DNG Preview & Metadata.

D Fosse

Community Expert

There's no contradiction. A DNG is generally slightly smaller than the corresponding proprietary raw file.

The denoised DNGs are bigger because it contains three channels instead of one, as a "normal" unmosaiced DNG does.

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Gerard Keet作成者

Inspiring

Clear, thnx.

DdeGannes

Community Expert

I would consider the enhanced DNG file as a work in progress file, use it to finalize further edits in LrC / PS, to create a tiff / jpeg dependent on your immediate needs. You can then delete the DNG and keep the original raw image.

It's likely there will be further enhancements to the Enhance / DeNoise AI feature and you will require the original raw image to benefit from them.

Regards, Denis: iMac 27” mid-2015, macOS 11.7.10 Big Sur; 2TB SSD, 24 GB Ram, GPU 2 GB; LrC 12.5,; Lr 6.5, PS 24.7,; ACR 15.5,; (also Laptop Win 11, ver 24H2, LrC 15.0.1, PS 27.0; ) Camera Oly OM-D E-M1.

G

Gerard Keet作成者

Inspiring

Thnx for replying. I always save the original raw files for required reprocessing in the future. It's clear the AI denoise is a destructive process making the dng files not appropriate as a base image file.