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


suppose for some unknown reason you devellop a film (TMax100) for 6 minutes
instead of the 10 minutes you should have used. You could probably still
print it right?

Does this mean that it wasn't a mistake to devellop for 6 minutes?

It's the same with the images I provided, the center image is more then
likely to be printable since that's what most of you start with. I'm just
saying the one on the right should be easier to work with.


----- Original Message -----
From: <john@johnbrewerphotography.com>
To: <alt-photo-process-l@usask.ca>
Sent: Friday, March 14, 2008 10:40 PM
Subject: 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
> 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
> 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
> 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
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