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DPChallenge Forums >> Hardware and Software >> File extension jumble: What am I working with?
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03/23/2013 01:32:40 AM · #1
Perhaps others have struggled with this, or perhaps it's nothing that needs thought. I'm kind of losing it and haven't been able to find any advice online.

My Lightroom default for external editing is to export to Photoshop CS6 as a PSD file.

I noticed, in Photoshop, I couldn't find the history of a file after I merged layers, so that got me poking around...

I found the tabs of the photos with which I am working in Photoshop all say .dng, though they are supposed to be .psd files. Have I really been working on RAW files in Photoshop and not PSD files? I know this was not always the case.

Weirder, if I select "File Info" from the File menu, it reads "Format: image/tiff" What?!

If I save the file, the extension in the tab then switches to .psd, but not unless I manually save it.

Then, if I select "File Info" from the File menu, it reads "Format: application/vnd.adobe.photoshop"

I can't make sense of this. I've double checked all settings and everything appears to be as it was and should be. Can anyone help? Thanks in advance.

03/23/2013 10:42:44 AM · #2
I still can't solve this riddle.

If anyone practices the Lightroom > Edit in Adobe Photoshop workflow, could you please give it a quick look and report what your (in Photoshop) tabs and file info say? I'm worried a plugin I've installed has gummed up the file conversion settings.
03/23/2013 11:12:01 AM · #3
I had the same problem what I had to do is the rename the extension to PDF and then opened in PS/Lightroom and worked fine but my case was only one file that had this problem. Though still dont know what happened and why.
03/23/2013 11:21:18 AM · #4
What you see is perfectly normal.

Photoshop cannot work on RAW files, they have to be converted, usually using Adobe Camera Raw, or in your case, Lightroom, which is essentially a packaged version of Adobe Camera Raw anyway.
Once converted according to your settings, the image data have to be organized according to some sort of standard to be exported: Lightroom can do that in TIFF or PSD. Visually and conceptually, they are the same, you will end up with the same image in Photoshop (make sure to use 16-bits per components and a large color space, such as ProPhoto RGB if you want to keep the best quality). There is no real reason to chose one over the other at this stage: there are a few technical differences but nothing worth worrying about (the loss-less compression algorithm is not the same, the saved metadata are not the same, but the image itself is exactly the same). In fact, the content of the image itself will always be exported as TIFF, because Lighroom cannot handle advanced versions of the PSD format (which implements specific loss-less compression for example): this is why you see "Format: image/tiff" in the file properties in Photoshop, regardless of your export settings in LR.

That being said, for some reason, when exported from Lightroom, Photoshop shows the original filename (i.e. FILENAME.DNG or FILENAME.CR2 etc.) even though it is not a RAW file anymore. I suppose this is simply to help you make sure about the origin of the file, but don't be fooled by it: you are not working on a RAW file anymore (as you could in ACR or Lightroom). It's just a temporary name, nothing else, you are working on a TIFF. The "real" file format will take place when you save the project (which is why you see "Format: application/vnd.adobe.photoshop" after the first manual save).

To conclude: it's all good, don't worry ;-)
Hope this helps!
03/23/2013 11:43:25 AM · #5
Thank you very much, guys.

Christophe, I was hoping that was the case, as I noticed no difference in file handling or performance, so I really appreciate you taking the time to spell it out so clearly.

And now, back to my regularly scheduled over-editing... ;)
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