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Subject: Re: raw 3.1 professional custom profiles for highend digital cameras

Bruce Fraser said:

"BTW, I don't think you really want to see a linear histogram. You'd see a whole bunch of data clumped at the left, and a 1-pixel line extending toward the right that would be just about impossible to see on a camera LCD. A highlight warning that wasn't one stop off would be useful, though, especially if you could see it BEFORE taking the shot."


The idea of looking at a histogram of the linear image data came to me after I looked at Roger Clark's web site where he plotted the 8 bit jpeg output of a Canon 10D against the linear data. The jpeg transfer function clips about 1 stop of dynamic range. Since the camera histogram display is that of the converted jpeg image it doesn't display the full dynamic range captured by the sensor and is misleading as we all know.

BTW, I did look at a gamma 1 histogram and found it to be pretty much as you said. So I would suggest that the camera should display a gamma corrected but full range histogram of the image without the jpeg 8 bit clipping.

For those interested, gamma 2.2 and gamma 1 histograms are shown.


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