[bird (Anthony Wesley)]

Having tried a DMK21AF04 camera last night in comparison to my other cameras I made some observations about the gamma setting that other people might find interesting.

Looks like the minimum displayed gamma value "10" corresponds to a real gamma of about 0.6 or so, and the maximum displayed value "22" corresponds to something like 1.5.

What does this mean, I hear you ask?

Well, the best setting for gamma when capturing is 1.0, ie no change to the image. I'd guess that on the DMK21AF04 this means setting the gamma slider to something like 15 or 16.

If you have the gamma less than 1.0 or greater than 1.0 then you're modifying the image data in a non-reversible manner that loses some information.

I've sent off a query to the manufacturer (TIS in Germany) asking for a formula to calculate actual gamma and gain values from the displayed register values, when I get that then we'll know exactly what the gamma slider should be set to.

regards, Bird