From: Jack Fulton (jefulton1@attbi.com)
Date: 09/20/02-09:37:59 AM Z
Quite honestly, I do not know how to sneer.
When you turn a strip into a posterized step of 21 shades, though it 'looks'
good you MUST check each step. There is a difference if you made the ramp in
RGB or grayscale. Normally the RGB requires tweaking.
If you printed it on a transparent material such as a mylar or if you had
Pictorico . . the inks are most likely not put on it so as to print evenly.
I've achieved a 1/2-way decent ramp by using a high-res laser printer rather
than a CMYK printer which is what I assume you use.
What it seems you are getting is ink-jet varying density on a clear
substrate.
Jack
> To all digital "experts" or wannabes:
>
> I have, between catastrophes, been trying to generate enough info on
> digital negatives (the first cause of the most hellacious upgrade in the
> history of ones & 0s) for an article slated for the vaunted P-F #8. I
> seem to be moving backwards, however, stumbling in well-covered ground.
> For instance, here's how I made a 21-step for digital tests:
>
> I made a ramp from zero to 100% in Photoshop, then posterized it into 21
> steps.
>
> (Even if you did this at 5% and 95% I doubt results would be much
> different.)
>
> So here's my question:
>
> Why does it print fewer steps -- on each of 5 substrates I'm testing --
> than the Stouffer 21-step I'm printing next to it.
>
> And I mean by about a third.
>
> And here's my other question -- the Stouffer 21-step shows lovely even
> steps -- about 6, 7 or even 8, in various gum emulsions, depending on
> length of the soak. My digital 21-steps from hell are, except for the ones
> on mere vellum (feh!, kid stuff) wildly uneven -- sort of grand canyon
> leaps at top, then squished at the bottom. (The vellum "curve" is quite
> straight... but the material is otherwise problematic and I'm trying to
> find something better.)
>
> Sneers OK if info is good.
>
> Judy
>
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