Leica M11 Appears to Be Doing Lossless Compressed DNG, for Solid Savings
I am pleased to see that the Leica M11 appears to be delivering lossless-compressed DNG.
That’s slick, since the Leica SL2 produces only uncompressed DNG as far as I can tell, its file sizes varying only a few percent, depending on the embedded JPEG.
The evidence is irrefutable: for the exact-same capture varying only by ISO, the file sizes steadily increase with ISO. The explanation is that because of the increasing noise (increasing randomness, greater entropy), which makes it harder and harder for data compression to compress the files.
File size is also a crude but inescapable metric for total captured detail.
Compressed file size at ISO 64 is around 78MB, for an approximate savings of at around 25%, relative to the total file size (which includes EXIF, embedded JPEG, etc ).
If the were uncompressed the minimum file size for its 14-bit files would be 105MB (14/8*60) or more likely, 120MB. Plus the additional stuff and an embedded JPEG.
And of course one could just read the technical specifications!
DNG (raw data, loss-free compression), DNG + JPG, JPG (DCF, EXIF 2.30)
