Re: Photoshop curves for printing negatives for cyanotype?

The "classic" method is to apply the curve and then invert. That is
Burkholder's method, so most of us follow it.

In theory, with a different curve, you could easily reverse the steps.

Michael is correct, someone else's curve won't be correct for you. Too
many variables. But, someone else's curve can be a good starting point.
Here is my photoshop curve data for classic cyanotype, 1.5 parts A to 1
part B, Cranes Platinotype paper, UV tubes exposure, Burkholder style
colored neg, Epson 1280, Media Street ink (what did I say about "too
many variables"??):

In : Out
0 : 0
13: 70
26 : 103
39 : 119
51 : 133
77 : 144
103 : 152
128 : 159
153 : 165
179 : 170
204 : 175
230 : 180
242 : 186
255 : 210

Hope that helps,
Tom

On Friday, June 24, 2005, at 12:02 AM, Christina wrote:

> What it the right way?
> - first apply curve then invert the picture or
> - invert the picture and then apply the curve?
>
> I know that you get different negatives with the two.
> Thanks
> Christina
>
> http://www.fotografisches.at
> http://www.fotoblog.fotografisches.at
>
>
>
> -----------------Joch Christina----------------
>
>
> -----Original Message-----
> From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
> Sent: Donnerstag, 23. Juni 2005 16:34
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Photoshop curves for printing negatives for cyanotype?
>
> I have a curve for cyano, but, as others have pointed out, it probably
> won't
> work for your combination of chemicals, paper, UV exposure, negative
> material etc. Contact me off list.
>
> ~m
>
> ----- Original Message -----
> From: "Christina" <darvida@gmx.at>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Tuesday, June 21, 2005 1:48 AM
> Subject: Photoshop curves for printing negatives for cyanotype?
>
>
>> Hello,
>>
>> Does anyone have a curve for Photoshop for Cyanotype?
>> I've got one for vanDyke and Photopolymer, and I'm very satisfied with
> them.
>> Or can anyone tell me the steps of o curve, so I can build them on my
>> own?
>> I hope you know what I mean.
>> Thanks
>> Christina
>>
>
>
--------------
Tom Ferguson
http://www.ferguson-photo-design.com
Received on Fri Jun 24 08:39:36 2005