In a message dated 12/7/06 10:58:29 am, mail@loris.medici.name writes:
> ep. Additionally as Katharine pointed out (and kindly tested), results with
> mixtures may not come out as you expected. As for making the color muddy:
> Don's right, but I think that will occur only if you add too much black - my
> suggestion was to add very little black. Anyway, you have many options to
> try now - please return us with the way works for you later.
>
> BTW, to all: How do you determine your standard printing time with gum?
>
> Since calibrating Argyrotype I determine SPT by overexposing a step tablet,
> then scan it, average the tone in the steps, change the mode of the file to
> Lab, create a new grayscale file from the Luminance channel and use the
> levels adjustment tool with the Alt key to locate the first black square.
> Then I make the necessary exposure time adjustment (by counting steps below
> the first black and reducing the exposure according to this) and retest
> (using the same step tablet along with the CDRP) to see if everything's
> right and to determine the negative color. It was surprising to see that the
> density I was choosing with the former method (visual inspection of the step
> tablet) was often 1-2 steps off (overexposure - I was often choosing an
> exposure time which causes solarisation = less dmax)... What would be your
> comments on this?
>
> Regards,
> Loris.
>
Loris
My comment would be that you are very much overcomplicating something which
is inherently simple.
Terry
Received on 07/12/06-08:04:52 AM Z
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