From: epona (acolyta@napc.com)
Date: 07/30/03-04:12:51 PM Z
Hi Sam,
Thanks for your suggestions. For this 16 bit business to work, don't I
have to start with a file scanned in 16 bit mode? I did try switching
to 16, doing all my corrections, and then printing. The resulting neg
didn't look much better. I guess I'll just have to keep messing with
the curves.
Thanks to everyone else's advice as well - I did try adding 2% gaussian
noise, but it's till not there yet.
Cheers,
~christine
stwang1@bellsouth.net wrote:
>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
>>
>>
>
>
>
>
--
The animals of the world exist for their own reasons. They were not made for humans any more than black people were made for white, or women created for men.
~ Alice Walker
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