U of S | Mailing List Archive | alt-photo-process-l | RE: Tone mapping: was Re: curves and gum and Christopher James book

RE: Tone mapping: was Re: curves and gum and Christopher James book


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.



-----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.


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