stwang1@bellsouth.net
Date: 07/29/03-07:41:05 AM Z
Christine,
The posterization has nothing to do with the size or resolution of your file. It has to do with
bit depth: 16 bit files can eliminate it.
Of course most of us use 8 bit files. To translate what your monitor shows you to negative
densities that would print well in the process of your choice is not easy. You'll need a
curve adjustment. Unfortunately someone else's curve may not fit your particular need.
I'm beta-testing Mark Nelson's system of customising curves and I've been able to
eliminate the posterising, plus producing negatives that print predictably, in Pd with the
contrast mix I choose, in cyanotype, and in gum.
So, acquire and manipulate your images in 16 bit mode. That would help a lot - just look
at the histogram afterwards and you'll see a big difference from that of 8 bit files. Then
work out a curve to fit your need, or wait for Mark to distribute his system.
Sam Wang
>
> From: epona <acolyta@napc.com>
> Date: 2003/07/29 Tue AM 08:59:19 EDT
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: inkjet negs
>
> many thanks to all who responded. i had run a nozzle check and a head
> alignment before i got started. turns out upping the dpi to 2880 and
> changing the media to photo quality glossy film did the trick. BUT NOW.....
>
> and you all knew there would be a "but now" didn't you?
>
> the gradients of my sky are posterized. which i don't get since i'm
> working with a large-ish file of 55mb. should be enough for an 8" x 8",
> nay? and the whole image seems pretty weak in overall density wher the
> print looked great. how to get more ink on the pictorico film? or is
> this what all inkjet neg people suffer with?
>
> thanks a bunch,
> ~christine
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