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Re: GH3 = attempt at Photographic Dynamic Range
In reply to Anders W,
5 months ago
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Anders W wrote:
Detail Man wrote:
Anders W wrote:
Detail Man wrote:
exdeejjjaaaa wrote:
black frame shots from GH3 uploaded to http://sdrv.ms/Sy1aP8
Hmmm. Looked at the ISO=125 and ISO=200 RAWs. RawDigger reports no black-level subtraction being used whatsoever(?), and shows a very clean noise distribution (all in the zero bin, not a thing in any of the higher bins). The Standard Deviation is (in both cases) somewhat higher than that of the EM5 (at base Sat ISO=107) and the GH2 (at base Sat ISO=167).
(Manufacturer rated) ISO=125 ~ 1.3 ADU
(Manufacturer rated) ISO=200 ~ 1.1 ADU
See my previous post DM. RawDigger probably has no idea about the intended black-level offset at this stage but the mean of the read-noise distribution is about 144 so it should be about that point. Don't know what you mean when you say everything is in the zero bin. All I see in that bin is some 10, presumably dead, pixels per channel.
OK. I had managed to miss the noise distribtion sitting up there completely. I wonder what that weird looking "notch" is (just to the left of the center of the noise-distribution, at ADU=142) ?
So do I (see previous post). Got any better ideas than mine?
It looks to me like a quantization error due to 12bit encoding-decoding.
It should be a gaussian (symmetrical) distribution isn't it ??.
So to normalize one should shift some of the pixels which have a value of 143 to 142 until the 143 population becomes equal to the 145 population.
I remember that there is a member of dpreview forums who has a deep knowledge on Panasonic raws and the algos to decode-linarize the data. Cannot remember who he is ..
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