Pre cal only messaure the RGB "canons" in your monitor so they can
adjust to be even.
The new Opti cal 3.5 version and advanced settings does not set
CRTmonitors contrast att 100%
Best regards Mikael Risedal
>From: "Robert Meier" <robert_meier_photo@yahoo.com>
>Reply-To: filmscanners@halftone.co.uk
>To: risedal@hotmail.com
>Subject: [filmscanners] Re: CRTs vs LCDs & PhotoCal
>Date: Mon, 21 Jan 2002 23:18:26 -0800 (PST)
>
>
>--- Colin Maddock <cmaddock@clear.net.nz> wrote:
> > The blacks need to be neutral before the whites are adjusted.
>
>That is one thing I was always wondering about. When I use the factory
>settings of my Sony 400PS and turn up contrast to 100% the blacks have
>a red cast. The factory settings for 6500K are
>
>Bias: 56(R), 61(G), 41(B) and
>Gain: 91(R), 83(G), 67(B).
>
>Reading through the documentation of PhotoCal by ColorVision it seems
>PreCal does not make any adjustments to the blackpoint but only the
>whitepoint. Did I get something wrong here?
>Also Nuno Sebastião has pointed out that bias should be 0 and gain
>should be 1. I would assume that a bias value of 50 represents an
>effective gain of 0 in order to make negative and positive adjustments.
>Now applying the same to gain I would also expect numbers around 50.
>Obviously, this is not the case but all numbers are way above 50. So
>what is bias and gain really?
>
>Thanks,
>
>Robert
>
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Mikael Risedal
Photographer
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