[argyllcms] Re: 1st post (improved estimation of blackpoint using a digital camera)
- From: Knut Inge <knutinh@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 9 Dec 2010 08:13:54 +0100
I have this nice camera that measure photons quite lineary over a large
dynamic range (3000:1 or so) presented in a raw file. Exposure can even be
shifted to cover different ranges with better SNR, and spatial samples can
be averaged to improve SNR with regards to random noise. Can I use it to
estimate (at least) the luminance-gamma at the bottom of the scale and/or
estimate the error of my calibrator in this respect?
http://clarkvision.com/articles/film.vs.digital.summary1/index.html
<http://clarkvision.com/articles/film.vs.digital.summary1/index.html>
> A lot of instruments aren't very accurate or stable near black.
>
> In some simple comparisons I've done, I've seen extreme differences
> between different colorimeter instruments, sometimes of the order of 10-20
> DE
> for saturated colors.
>
> Graeme Gill.
>
>
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