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DNG files seem too large

Joined
Jul 19, 2014
Messages
23
Location
Crickhowell, S Wales
Lightroom Experience
Intermediate
Lightroom Version
Lightroom Version
ClASSIC 9.2.1
Operating System
Windows 10
Whilst researching on the effect of the different ways on importing raw files into LR Classic, I noticed that some of my DNG folders were much larger than those holding the original raw files. Using a different catalogue, I re-imported the raws, again as dng. I found that the new dng folder was >50% smaller than before, and around 30% smaller than the raw - just what I'd originally expected.

I'm intending to review my other folders to see if the same problem affects them, but can you please explain how this phenomenon occured? I have had problems with smart previews being too large - now fixed - so maybe something to do with that?
 

PhilBurton

Lightroom enthusiast (but still learning)
Premium Classic Member
Premium Cloud Member
Joined
Nov 16, 2015
Messages
2,239
Location
California, USA
Lightroom Experience
Intermediate
Lightroom Version
Classic
Joined
Jul 19, 2014
Messages
23
Location
Crickhowell, S Wales
Lightroom Experience
Intermediate
Lightroom Version
I compared overall size of folders of original raw files with those of dng's, to identify the folders with the (biggest) problems. Where the dng's were >= size of raw, I re-inputted to a new dng. Some re-editing needed but fortunately not too much.
 
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