RE: Tone mapping: was Re: curves and gum and Christopher James book
Yves But they're not alt images! What you are showing here means nothing to me, and I'm sure I'm not alone, (but maybe I am). Can you reproduce what you are trying to explain with alt prints, then I'm sure it will be understandable to those like me. To be honest, on my (calibrated) monitor the differences in your examples would be negligible when printing in gum. In other alt processes maybe the differences would be more noticeable, but showing real alt prints alongside your scales would be much more beneficial to the list in my opinion. Cheers, John -----Original Message----- From: Yves Gauvreau [mailto:gauvreau-yves@cgocable.ca] Sent: 14 March 2008 20:03 To: alt-photo-process-l@usask.ca Subject: Tone mapping: was Re: curves and gum and Christopher James book Dan and all, They say an image is worth a thousand words, so here is one that will speak for me http://users.skynet.be/philippe.berger/Degrade01.jpg. I always say I'm not good enough in english and that I don't have the vocabulary to express ideas and concept acceptably. I hope this image will help you make your own judment on this tone mapping stuff. I also say thanks to Philippe Berger for putting this image on his site. This image shows 3 simple gradients. On the left you have a strait gradient from black (0) to white (255), lets say it's our original. In the center you have the same left image map linearly to a real world carbon print max black to max white with no tweaking of any kind. This is what stretching the scan does before it is almost burried by the printing process fuzzyness and other tweaking one might add. On the right, you have yet another mapping of the left image to the same max black to max white as in the center but this time it was done in an attemp to preserve as much as possible of the original caracteristics. Regards, Yves -- No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.7/1328 - Release Date: 13/03/2008 11:31
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