----- Original Message -----
From: "Tom A. Trottier"
> On Friday, September 28, 2001 at 9:15, C.H.Ling <olympus@xxxxxxxxxxxxxxx>
> wrote on "Re: [OM] [OT] Sensia II vs. Provia.," saying..
>
> > After thinking again, I think both 8 stops and 10 stops are wrong.
> > 1000:1 should be equal to around 5 stops only. Since contrast ratio is
> > linear ratio and EV or stop value is energy, which follows square law.
>
> No, each stop is a doubling & 2**10 is 1024, so 10 stops for 1024:1
>
Okay, I stand corrected (the right English terms?)
> >
> > Again, LCD monitors has common contrast ratio of 1:350-500, which
> > still need improvement, obviously they think it is not enough to
> > compare with CRT. At the mean time you can see the Gas Plasma display
> > has 1:3000 contrast ratio which is using in Hi-end TV display. Do you
> > need a display to handle over 10 stops contrast different? No, I think
> > they are just close to the slide's quality and D-range of around 3.5
> > (between 5-6 stops).
>
> Density is log10 of comparative opacity, so 3.0 = 1000:1 and
> 4.0=10,000:1 and D 3.5 = 3,162:1
Yes, D3.5 is equal to 1:3162 and in practical no diff from what I mentioned
1:3000.
C.H.Ling
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