From: Larry Roohr (larry.roohr@comcast.net)
Date: 08/12/03-09:09:23 AM Z
Juan,
This curve is derived from densitometer readings directly off of the
pictorico negative, it linearizes the step ramp from min to max density
for a photoshop step wedge printed on the pictorico. So this curve is
independent of the printing method. All it gives is even density
increase steps measured wth a visible light densitometer.
Larry
JUAN MIGUEL JUSDADO wrote:
>Larry, is the curve for cyanotipe or Vandike?
>
>-----Mensaje original-----
>De: Larry Roohr [mailto:larry.roohr@comcast.net]
>Enviado el: martes, 12 de agosto de 2003 15:08
>Para: alt photo
>Asunto: Re: Epson C82 Printer and Digital Negatives
>
>
>In the C80 if you select a glossy media in the printer driver the black ink
>is not used, it's just CMY. While this will limit the density's you can get
>on pictorico, it also makes for a very well behaved curve at the dense end
>and works beautifully. Here is a curve I worked out for the C80 with glossy
>media, 2.2 gamma, and color controls set on photo-realistic, in the Epson
>driver. This curve is applied after you invert, just before printing:
>
>0 5
>5 17.25
>10 28
>20 42.6
>30 55.5
>40 65.86
>50 73.53
>60 80.28
>70 84.34
>90 91.89
>95 93.45
>100 95
>
>It's easiest to input this as a transfer function, save it, then load it
>into curves. Be sure to reset your transfer function after saving the curve
>as I think it gets saved and applied when you print if your not careful.
>
>Larry
>
>----- Original Message -----
>From: "Alan Mynett" <a.mynett@ntlworld.com>
>To: "STUART GOLDSTEIN" <alt-photo-process-l@sask.usask.ca>
>Sent: Tuesday, August 12, 2003 4:46 AM
>Subject: Re: Epson C82 Printer and Digital Negatives
>
>
>
>
>>Hello STUART,
>>I have really only just started making digital negatives, so this
>>feedback may be premature. I have a C80, though I use Jet-Tec Inks in
>>it (because they're cheaper). Pictorico has only recently become
>>available in the UK from Nova. First trials suggest that I can get a
>>max density of around 2.0 (using my Epson 2450 and Vuescan software as
>>a densitometer - details at www.mynett.org.uk/ep2450/2450densi.htm .
>>This is certainly enough for cyanotypes. I'm still working on the optimum
>>
>>
>curve to apply.
>
>
>>--
>>Best wishes
>> Alan
>>
>>http://www.mynett.org.uk
>>
>>
>>
>
>
>
>
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