RE: another 3 layer gum attempt
Paul, see this comparison for RGB versus CMY(K) negatives (no curve applied to both sets): http://www.loris.medici.name/gum/RGB_vs_CMY/ To me (with my methods) the CMY negatives are unprintable if you need shadow detail... (The separations were made with 0% black, so there's not a missing channel there!) Probably others have adjusted their workflow to able to print those negs, mine is definitely not adequate... Any hint would be highly appreciated. Regards, Loris. ________________________________ From: Paul Viapiano [mailto:viapiano@pacbell.net] Sent: Friday, July 17, 2009 7:52 AM To: alt-photo-process-l@usask.ca Subject: Re: another 3 layer gum attempt As I continue on my journey, I decided to look at some CMY separations (printed pos, not negative) on the web tonight and in some books I have (Benson - The Printed Picture). I wanted to see what they looked like in terms of relative density, etc. It was interesting to note that the Y separations, looked much denser than the C and M. In fact, large parts of the shadows look almost blocked on the Y. I was curious because today I printed a first layer Y, using more pigment in the mixture (1 gram / 9ml gum) rather than my previous (.6 gram / 9ml gum). The neg remained the same and I cleared for 20 minutes, and it looks much darker than any other Y layer I've printed thus far, but holding detail quite well. Tomorrow I'll try to finish it and see what I come up with. I think this is a move in the right direction. Thanks for letting me collect my thoughts here... Paul
|