[alt-photo] Re: 3 color gum and PDN calibration?

[Mary]

On 9/26/2012 2:59 PM, Johnny Brian wrote:
> With overexposure the steps on the wedge should merge,
Yes, but I thought you said they were merging, i.e. all looking about 
the same:
"I printed with yellow at 5m 40sec, 8 min and 11m 20sec, and they 
actually look about the same - the longer print times are a bit darker"

Sorry, I guess I misunderstood. My thought was that you had already 
exceeded the point at which the steps were distinguishable. The goal is 
to find that point where at least 2 steps are indistinguishable so you 
can pinpoint that ideal time, right?

I agree with Marek that the darker print times may be dichromate stain 
due to overexposure, not true tonal differences.

I have to admit that after struggling with PDN for calibrating gum, I 
kind of gave up. I just didn't have the patience to deal with it. I 
remember yellow being particularly frustrating. I admire your tenacity!

Mary

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