On May 21, 2005, at 5:19 PM, [EMAIL PROTECTED] wrote:
I guess the most important thing I got from your response was that
the
histograms of the same scene, shot in Raw and JPEG will be different.
Do JPEGS *have* histograms? I thought that was a part of the RAW
file format?
No brightness histogram data is captured and stored in any file
format. It's a 'live' analysis rendered by software analyzing the
image data.
The histogram display of any camera is derived from the in-camera RGB
rendering, which is what's used to write the JPEG file and thumbnail.
It's not derived from the RAW data because the RAW data is not
rendered to an RGB chrominance and luminance image. The histograms
presented by a RAW converter are the only histogram displays of the
RAW data itself.
Godfrey
