On May 22, 2005, at 3:39 AM, Paul Stenquist wrote:
I was trying to put it in simple terms: The firmware performs a set
of adjustments on the RAW data when one shoots jpeg. That will
serve to explain the difference in appearance for the average
hobbyist. Only a few people here know what a Bayer matrix
interpolation or a quantization space are, but I thank you for the
technical details.
Simple terms is fine, but suggesting that the camera's exposure
system does something different when evaluating and setting exposure
dependent upon whether the camera is in JPEG or RAW format storage
mode is misleading.
Put simply:
- A RAW format file contains unrendered image data.
- A JPEG file contained rendered and compressed RGB image data.
- Displaying the RAW data involves rendering it to RGB. A RAW and a
JPEG file stored simultaneously from the same exposure will only look
identical if the RAW conversion processing applied to the RAW file is
identical to the rendering built into the JPEG file in every particular.
Godfrey
