The variation is in the size of the embedded JPEG preview(s),
primarily. The Pentax DNG files are uncompressed with regard to the
sensor data.
Some cameras, like my E-1, produce RAW files which are always the same
size because the embedded JPEG preview is set to always fit within a
particular logical file size (not the same as the actual number of
data bytes. And others. like the L1, always have a fixed RAW file size
because they do not embed a JPEG preview in the RAW file, they put it
into a JPEG sidecar file.
Pentax PEF files use lossless compression on the sensor data AND have
large JPEG previews embedded in the RAW files. Both vary depending
upon the nature of the data so there are wide variations in size, file
to file.
Godfrey
On Nov 10, 2008, at 8:24 AM, PN Stenquist wrote:
My RAW DNG files, which I believe are uncompressed, typically vary
from about 22.8 megabytes to 23.5 megabytes.
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