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R
Rip321
Known Participant
May 15, 2024
Question

combing areas from two DNG’s pre-Lightroom processing

  • May 15, 2024
  • 2 replies
  • 1593 views

Am I missing a way to splice together sections of two DNG files and then run Lightroom Noise Reduction and Lightroom Presets on the combined DNG?

 

I tried masking in open eyes from one DNG over blinking eyes in another DNG in Photoshop in 32 bit mode and saving to a TIFF file, but the TIFF file has already lost a lot of detail when opened again in Lightroom.

 

Thanks!

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2 replies

Z
ZappaJul
Participating Frequently
May 19, 2024

As others have explained, you can't splice RAW files in LR, but a correctly set up RAW file will look identical in .tif or .psd format once opened in PS. I'd suggest this workflow:

 

  1. Set LR external editing prefs to Adobe 98 col space / 64bit / save to .tif or .psd / high res (most people choose 300ppi, but 360ppi better in many printed scenarios).
  2. Process both DNG RAWs in LR > use Reference View to ensure colour consistency > DeNoise on both > R-click > Open as Layers in PS > ensure open eyes layer on top > auto (or manually) align layers so eyes match > add inverted Mask to open eyes layer > brush in open eyes > sharpen if required (use seperate merged layer) > save > automatically reappears in LR (useful for project management / exporting multiple files in uniform format).
  3. You might want to consider a coding system to easily differentiate between PS edited files saved back to LR, and LR RAWs. (I do this by tagging blue in LR and auto-renaming external edits to denote app used, eg: name_original_file_number-PS.tif for files externally edited in Photoshop, or name_original_file_number-TPZ.tif for files edited in Topaz.

 

dj_paige
dj_paige
Legend
May 16, 2024

"Splice together sections of two DNG files" is not a feature of Lightroom Classic. This has to be done in Photoshop.

R
Rip321Author
Known Participant
May 16, 2024

Thanks.  I'd prefer to make my edits to the DNG before running Lightroom Denoise and Lightroom Masks.

 

If Photoshop can't edit a DNG for processing in Lightroom, what software can?

R
Rip321Author
Known Participant
May 18, 2024

Thanks for your help.

 

How can I tell if a DNG file contains RAW data or RGB data?

 

This article from the Adobe blog says Lightroom Denoise produces a raw file:

 

"After multiplying and adding up a gazillion numbers, your computer will produce a new raw file in the Digital Negative (DNG) format"

https://blog.adobe.com/en/publish/2023/04/18/denoise-demystified

 

The only difference in the DNG metadata of the original and the Denoise DNG is the compatibility field, and both have Mosaic Data: Yes.

 

Also, there must be something I don’t understand about working with 32bit TIFF files in Lightroom.  If I open the original DNG in Photoshop, save it to a 32bit TIFF without any adjustments, and then open it in Lightroom without any adjustments, the histogram goes from this:

 

To this:

 

Thanks again.


Thanks.

 

If the metadata of the DNG file created by Lightroom Denoise is inaccurate, and the file has, in fact, been converted to RGB, where can I find the RGB bit-depth in Lightroom?

 

Also, does running Lightroom Denoise eliminate the benefits of working with RAW files in Lightroom to adjust Exposure, Whites, Highlights, Blacks, Shadows, Texture, Clarity, Dehaze, Sharpness, HSL, etc?

Is the correct workflow to export the DNG's generated by Lightroom Denoise to Photoshop directly without any Lightroom adjustments?

 

Also, I'd still like to understand how to open a 32bit TIFF file in Lightroom without the image becoming washed out and overexposed.

 

Thanks again.

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