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06/16/2012 12:56:43 PM · #1 |
Can someone offer some insight into the Lightroom function, Copy as DNG? (I'm on 3.6 at the moment.) I'm familiar with DNG (digital negative) as an open standard, versus proprietary RAW formats. However, I shoot a Ricoh camera which already produces a DNG. When I advertently invoked this feature, it copied my DNG's and made them smaller. I would expect this when converting from something proprietary, but to go from DNG to DNG and have the file size almost cut in half was a surprise. I restored my originals because I wasn't sure. If it's a lossless compression, however, I might be interested.
Does someone know? Nothing I'm finding on the web addresses this specifically.
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06/16/2012 01:43:47 PM · #2 |
That's a really interesting question, and one for which I don't have an answer. DNG is really just a container; kind of a wrapper containing image data (can be RAW, TIFF, etc.) and instructions for interpreting that data. I guess if the DNG written by the Ricoh camera contains uncompressed RAW data, it's certainly possible that lossless compression could reduce the file size substantially. That would be my guess as to what's happening, but I'm far from sure.
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06/17/2012 11:19:36 AM · #3 |
| Well, thanks for chiming in. That's my guess too. Might be a better question for the Ricoh forum at dpreview or the Adobe Lightroom forum... |
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06/17/2012 01:56:16 PM · #4 |
According to Wikipedia, it supports lossless TIFF compression.
Link to Wiki
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