windeking asked: I have a few questions about your calibration technique. Did you calibrate for each color? When you did the calibration, how did you determine how long to expose the step wedge? Did you do multiple exposures with the different ratios of gum to sensitizer? In the third set of exposures of your workflow, you say to expose just long enough to achieve tone in step three, but you already have tone up to step eight from set 2. Am I misunderstanding something? Thanks Alan
The exposure times are a result of experiments with different gum:sensitizer ratios with multiple layers. The exposure time, development and ratio I use are the same for all three colors–with the exception of cyan where I tend to use a slightly shorter exposure time (about 15-30 secs shorter) than the yellow and magenta. The third set is a short exposure which adds additional color and tone in the shadows for enhanced D-max. Hope this helps. Tony
Tony Gonzalez is an artist currently living in New York City. He received his BFA from the Cooper Union School of Art and his MFA from Yale University. In addition to working as a fine art photographer, Gonzalez has taught photography for 30 years including at The Cooper Union, Pratt Institute and New York University. Since 2002, Gonzalez has been teaching full-time at Queens College, CUNY and is currently a Tenured Professor and Deputy Chair of the Photography & Imaging program. Gonzalez is a contributing author for The Book of Alternative Photographic Processes, Second Edition and Third Edition by Christopher James and is featured most recently in the news book Gum Printing, A Step-by-Step Manual Highlighting Artists and Their Creative Practice by Christina Z. Anderson and Alternate Processes in Photography by Brian Arnold.
View all posts by gumbichromatejournal
