Lightroom: Import - Copy as DNG and reduce size - like DNG converter

  • 3
  • Idea
  • Updated 6 years ago
  • (Edited)
I'd find the ability to import files as DNG and also give the option to reduce size as extremely useful - I don't always want the full 36mp from my d800. Currently I use the DNG converter to convert to a temp location at 20mp & then import to lightroom. Would be faster to do this in lightroom as single step, and add option for 24mp conversion.
Photo of Jeff Holdgate

Jeff Holdgate

  • 4 Posts
  • 1 Reply Like

Posted 6 years ago

  • 3
Photo of Victoria Bampton - Lightroom Queen

Victoria Bampton - Lightroom Queen, Champion

  • 4427 Posts
  • 1637 Reply Likes
You can do it once the photos have been imported into LR using the Library menu > Convert Photos to DNG. Lossy DNG isn't an option in the import dialog as it's considered a little risky (i.e. someone could convert to a lossy format during import by accident, destroying their only lossless copy)
Photo of Jeff Holdgate

Jeff Holdgate

  • 4 Posts
  • 1 Reply Like
Surely this is incorrect - the import dialog gives the option "copy as DNG" at the moment. What I was asking for was "Copy as DNG & reduce size"
The library option to convert to DNG does NOT give the option to reduce size at the moment.

What I'm suggesting is an import option "copy as DNG & reduce size" - already implemented in the DNG converter.
Photo of Victoria Bampton - Lightroom Queen

Victoria Bampton - Lightroom Queen, Champion

  • 4427 Posts
  • 1637 Reply Likes
The existing Copy as DNG option is a lossless process, so it's not considered risky. When you run photos through the DNG Converter, they're already off the memory card and hopefully backed up elsewhere.

Reducing the size while importing could potentially mean that someone is importing their only copy off a memory card, and then clears the memory card before realising that they now only have a reduced resolution lossy file. That's why it's not in the import dialog. I'm not saying that's the right decision, but that's the logic.

You're right about the Library Convert to DNG though - the Lossy conversion is in there, but I'd forgotten that the resolution downsize didn't make it. I agree that would be useful to include.
Photo of Jeff Holdgate

Jeff Holdgate

  • 4 Posts
  • 1 Reply Like
"
Reducing the size while importing could potentially mean that someone is importing their only copy off a memory card, and then clears the memory card before realising that they now only have a reduced resolution lossy file. That's why it's not in the import dialog. I'm not saying that's the right decision, but that's the logic"

Well if that's the logic its flawed, since the library convert to DNG option gives the user the ability to do just this - convert RAW to lossy DNG and then delete the originals ! If that's the line of reasoning that's being applied then the library convert to DNG option should not offer the option to delete the originals. Really one can baby sit the user too much.

There is no doubt that the option to convert to DNG (lossy or otherwise) & reduce resolution is a useful feature - not for file size reasons but for the sake of performance - I don't care so much about the file sizes - its lightroom performance on a 36mp file that drives the request for a resolution reduction. Even on 8 cores running at 4.6 Ghz its unacceptably slow. Reduced to 20 Mp its fine.
Photo of Scott Martin

Scott Martin

  • 197 Posts
  • 15 Reply Likes
I think it would be even more useful if one could reduce the file size/pixel count without lossy compression.
Photo of Victoria Bampton - Lightroom Queen

Victoria Bampton - Lightroom Queen, Champion

  • 4427 Posts
  • 1637 Reply Likes
You wouldn't gain much. The file would be demosaiced in order to reduce the pixel count, so depending on how far you were dropping the MP, in some cases the file size would actually get bigger.
Photo of Scott Martin

Scott Martin

  • 197 Posts
  • 15 Reply Likes
If there was a way to do it without demosiacing... Canon's sRAW format for example.
Photo of Jeff Holdgate

Jeff Holdgate

  • 4 Posts
  • 1 Reply Like
The assumption here seems to be that one wants to reduce resolution to gain benefits in file size - there are also performance benefits in lightroom to be gained - see my post above.
Photo of Scott Martin

Scott Martin

  • 197 Posts
  • 15 Reply Likes
And to add to this, the DNG currently doesn't support Canon's sRAW file format without converting them to an XYY format which causes the file size to ballon, negating the point of shooting smaller sRAW files. So if the DNG specification were to support smaller RAW files it could be a big help for both Canon and Nikon users. As cameras continue to grow in resolution, the demand for smaller RAW files will grow as well.
Photo of Rob Cole

Rob Cole

  • 4831 Posts
  • 384 Reply Likes
@v3.1 - Ottomanic Importer supports this feature.