Re: Digital negative curve update
RichLat@aol.com
Sun, 4 Aug 1996 14:37:57 -0400
>Yesterday I reported some possible Photoshop compensation curves for
>platinum and palladium. The data for those curves was gleaned from a
>digital step tablet made by Evercolor which seems to print quite well on
>Crane's Platinotype paper sensitized with palladium and developed in
>ammonium citrate. It also seemed to be reasonably close to the mark (a
>little fine tuning required) for a 1:7 mix of Pt/Pd, double-coated,
>printed on Arches Platine, and developed in potassium oxalate #2 (1 drop
>of sodium dichromate solution add per 200ml of developer).
>
>>Have you tried the correction curves that Dan Burkholder >>provides with
his
>>book - "Making Digital Negatives"?
One of the factors relating to different results from the two curves may be a
finer screen dot (400 line) from EverColor as opposed to the "dithered" dot
technique proposed by Burkholder.
A finer dot may produce more gain, requiring a cleaner curve.
-Rich