[Alt-photo] Re: GUM: problematic yellow?

[Luciano Teghillo]

I think that when I start layering the colors I will have to make other
adjustments, either to the exposure time, color mix, or negative. But for
now I was wondering if for blue I should use an exposure of 2 minutes (as
indicated by looking at the color page) or 3 minutes (as indicated by
looking at the grayscale version). In summary, are you suggesting that is
best, as a starting point, to evaluate the exposure time by looking only at
the grayscale version?

Luciano




-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
Alberto Novo
Sent: Thursday, February 06, 2014 11:28 AM
To: alt-photo-process-list at lists.altphotolist.org
Subject: [Alt-photo] Re: GUM: problematic yellow?

> So by looking at your modified jpg files, it looks like the magenta 
> printing time is 1.30 minutes (which I think also the color test 
> shows), the blue printing time is 3 minutes even if in the color test 
> I would say 2 minutes is good.
> 
> So I am confused. What is the best way to evaluate this printing time
tests?

Our eyes have a different sensitivity to the colors, see for example the
yellow print.
The best way is... to put all together! You could print a wide yellow test,
superimposing on the two sides cyan and magenta so that you will see how M+Y
and Y+C behave, etc.
But printing tricolor gum is not the same as monochrome. Usually, the risk
is to end with too saturated or contrasty prints. 

Alberto
www.facebook.com/alberto.novo.1
www.grupponamias.com
www.alternativephotography.com/wp/photographers/rodolfo-namias-group 

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