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Sending a raw image to Photoshop and using NoiseNinja will create a copy (PSD, TIFF, JPEG, depending on your preferences) and send that to Photoshop. This image will be part of your library. After editing and saving the images in PS, these changes are visible in Lightroom. If you will do further image correction in Lightroom on this file (now not the raw file) and you want to do some further editing in Photoshop with the recent adjustments in Lightroom applied you need again create a copy with Lightroom adjustments.
It is probably the best to make Lightroom Adjustment only to the raw files at the beginning of the workflow.
From the LR Help File
Edit in Photoshop or Photoshop Elements
You can do additional editing to your photo using Photoshop or Photoshop Elements from within Lightroom. You must have either Photoshop or Photoshop Elements installed on your computer for this feature to be available.
1. In the Library module or Develop module, select the photos you want to edit, and choose Photo > Edit In Adobe Photoshop or Edit in Adobe Photoshop Elements.
2. In the Edit Photo dialog box, select one of the following:
Edits the original file without Lightroom adjustments. (JPEG, TIFF, and PSD only)
Edit A Copy
Edits a copy of the original file without Lightroom adjustments. (JPEG, TIFF, and PSD only)
Edit A Copy With Lightroom Adjustments
Edits a copy of the original file with Lightroom adjustments visible.
When sending a copy to the external editor, the newly created file is automatically added to the library.
3. Click Edit.
After making edits in Photoshop or Photoshop Elements, you will be prompted to save any changes to the photo sent from Lightroom. Be sure not to do a Save As and rename the photo because the newly-created photo will not be automatically added to the library.
Important: When saving from Photoshop or Photoshop Elements, be sure to turn on the Maximize Compatibility option so that images can be read by Lightroom. Photoshop CS2 automatically saves PSD files from Lightroom with maximum compatibility.
Thanks for your explanation.
There is one matter I do not quite understand where you are saying: "It is probably the best to make Lightroom Adjustment only to the raw files at the beginning of the work flow"
What do you exactly mean?
Noise Ninja is best applied at the beginning of the work flow, which requires first of all to open in LR a raw file and, before any kind of editing, go to PS via "ctrl-E", reduce noise and save as a PSD to go back to LR and then begin editing in LR.
Yes you are right, noise reduction should be done at the beginning and 3rd party tools often do a better job than LR.
I was referring to the fact that once you send an image to Photoshop for further editing you leave the raw realm. If you do further editing in LR on the non-Raw image file (JPG, TIF or PSD), you will need to create an additional image file, if you want to do further editing in PS with the second round of LR adjustments incorporated.
So once you have left the raw realm, to my understanding back and forth editing in between LR and PS isn't that seamless as it sounds, as you need to create a new file each time (option edit a copy with Lightroom adjustments). Thus my recommendation to keep Lightroom adjustments to the beginning of the workflow.
Correct me, if you think my view is wrong.
IMHO I believe LR's strength is in the conversion of raw files in its develop module. I would do the following.
1.) Process in LR develop module, with the raw data, using all the tools you need there.
2.) Send this file to PS as a tiff or psd.
3.)The tiff/psd will be a true first generation image file with no prior pixel editing. You can then use NN to reduce noise as your first pixel editing and do further editing, sharpening etc in PS.
4.) Return the tiff/psd to LR.
You can try both processes and see which gives the best final result.
Thank you for your suggestions and advise.
Dennis: when going from LR to PS I use the, for RAW/DNG files only available option "edit copy with LR adjustments".
I assume that when opening in PS (as a PSD) all LR editing will then be applied to the original RAW which then changes in a PSD.
So noise reduction (with NN) can then only be done after LR editing which is not recommended by NN. I wonder whether this a serious disadvantage?
The advise of Thomas to apply and limit all LR editing before moving to PS sounds logical to me.
My point is that the raw file is not and image file and only becomes one when the raw converter produces the image file. LR has not "edited" the file hence the psd sent to Photoshop is the first original image file. If the original file in LR was a tiff or Jpg then I could understand your concern.
Even if you sent the file from LR without making any additional adjustments LR would have applied its default settings in rending the raw file.