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hortense submitted a new resource:
EDGE EFFECTS - EDGE EFFECTS
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comments from the previous article system:
By Claire Senft - 09:15 PM, 01-31-2006 Rating: None
This is a nice article Hortense. I have a disagreement with your terminology. A positive image from a mask when combined with a negative will reduce the contrast of the sandwhich requiring the use of a higher grade paper to restore contrast. Therefore the unsharp mask is a contrast reducing mask not a contrast increasing mask. If one would make a print with and without the mask on the same paper grade the contrast will be reduced. To make a contrast increasing mask one would need to combine a negative mask with a negative or a positive mask with a positive. Good luck with your masking.
By hortense - 05:02 AM, 02-01-2006 Rating: None
I did not sufficiently explain the context to this reference. Using an USM it will increase your need to PRINT on a high grade setting. Typically you want a 1-grade increase (or more depending on what you are seeking. Thank for pointing out need for better clarification.
By Daniel Lawton - 01:18 AM, 02-03-2006 Rating: None
Thanks for contributing a very useful article. I tried USM this summer with varying degrees of success but this makes me want to give it another go.
Mike Kriss, author of an extensive article on edge effects has given me permission to publish parts of his work, as applicable on APUG. As soon as I can get around to it, I will scan and upload this work. It was published by the SPSE and ICPS several years ago.