Camera Raw & DNG: Converting mRAW tot DNG makes them bigger than RAW

  • 1
  • Problem
  • Updated 8 years ago
  • Not a Problem
  • (Edited)
Using Lightroom for years now, I found a problem with my new Canon EOS 60D using m-RAW. I always convert these photos into DNG while importing in Lightroom3. Now I found that the photos then grow bigger than RAW photos.
So, now I have to shoot on RAW and get my SD-cards full fast, but in this way preventing my harddisk from overload.
Representative test picture:
18 megapixel: RAW 24MB, DNG 19 MB, JPG 8 MB
10 megapixel: RAW 15MB, DNG 24 MB, JPG 4 MB
4,5 megapixel: RAW 10 MB, DNG 11 MB, JPG 2 MB
Photo of Jaap Meijer

Jaap Meijer

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Posted 8 years ago

  • 1
Photo of Rikk Flohr

Rikk Flohr, Champion

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This is normal behavior for sRAW and mRAW files. The problem lies in that they are not true RAW files but rather a down-sampled version.

You can read about it in a older forum post here:
Photo of Jaap Meijer

Jaap Meijer

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@Rikk: thanks for the info. In fact that's the technical reason, but a consumer shouldn't have trouble from it. I expect that by good cooperation by Canon and Adobe, they can find a solution. #keepwaiting
Photo of Victoria Bampton - Lightroom Queen

Victoria Bampton - Lightroom Queen, Champion

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Don't hold your breath. Canon haven't been that quick to co-operate in the past - if they were, they'd offer DNG as an option directly, which would solve a whole host of issues, not just for Adobe but for other raw processors too.