Re: How to apply curves in PS for digital negatives...

Joe -

Since I am at work I could only take a quick glance - I will print them out
tonight. However, your curve looks much closer to what I was expecting to see.
 The curves at the other site showed that the author was decreasing contrast
and you are increasing it (I see the "S" curve).

Unless someone has a VD formula where a "normal" negative needs a reduction in
contrast (I doubt it), I cannot see how the other curves could possibly work.

Cheers -

george

--- Joe Smigiel <jsmigiel@kvcc.edu> wrote:

> George,
>
> You might find the following web pages of interest. They summarize some
> tests I ran last year for double-coated Van Dyke Brown printed using a
> digital negative generated in Photoshop and output onto Pictorico OHP
> using an Epson 2200 printer with Ultrachrome inks and printed onto
> Cranes' Kid Finish stationery. Be forewarned of nude content though.
>
> http://my.net-link.net/~jsmigiel/images/technical/vdb_test_11-19-04.jpg
>
> http://my.net-link.net/~jsmigiel/images/technical/VDB_test_prints.jpg
>
> The pages show before and after curve adjustment pics as well as
> positive/negative files, a graphical depiction of the curve applied to
> the *negative* image file, a table comparing %K values after curving
> and resultant transparency density, and a couple of final prints scanned
> for comparison of two slightly different curves. There are also digital
> density step wedges, both affected and unaffected by the curve
> adjustment, as well as Stouffer 21-step wedges printed along with the
> files.
>
> Prints were processed in Kalamazoo municipal water using a 2% citric
> acid initial wash and gold-toned using Clerc's gold-toner after fixing.
>
> :)
>
> Joe

Handmade Photographic Images - http://www.GLSmyth.com
DRiP Investing - http://DRiPInvesting.org

        
                
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Received on Mon Nov 28 12:17:21 2005