Digital BW, The Print

Technical question. I've got this 21step.tif file and I'm dying to
know why the steps are in 9% increments. Step wedges that I create by
hand (gradient, blur, posterize=21) give 5% per step. All this time I
was printing this image out and I thought I was getting 5% per step,
and I'm not.

I'm just trying to do my own profile for BO printing, since nobody has
offered one. Can anyone give me a reason to continue using 21step.tif?

-Pieris
digital darkroom blog: http://www.pmb.net/darkroom

Hi Pieris,

The 21 step grayscale fits in with the Photoshop curve. Each step 
corresponds to a line in the curve dialog or exactly between the 
lines. To use anything other than the 21 step you'd have to come up 
with a way to map your step to a particular position in the PS curve.

I'd be nice if Photoshop provides a way to customize the curve 
dialog. However using a single dialog design it's easier for people 
to share and modify curves.

--nick

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Pieris 
Berreitter" <pieris@y...> wrote:

> 
> Technical question. I've got this 21step.tif file and I'm dying to
> know why the steps are in 9% increments. Step wedges that I create 
> by hand (gradient, blur, posterize=21) give 5% per step. All this 
> time I was printing this image out and I thought I was getting 5% 
> per step, and I'm not.
> 
> I'm just trying to do my own profile for BO printing, since nobody 
> has offered one. Can anyone give me a reason to continue using 
> 21step.tif?
> 
> -Pieris
> digital darkroom blog: http://www.pmb.net/darkroom

*banging head on table*
You know, I must have done something really weird last night because 
21step.tif is working fine. Sorry about that. At least I recognized a
problem and the curve I built didn't suffer.

-Pieris
digital darkroom blog: http://www.pmb.net/darkroom

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Nick H. Nugent"
<nghin@p...> wrote:
> 
> Hi Pieris,
> 
> The 21 step grayscale fits in with the Photoshop curve. Each step 
> corresponds to a line in the curve dialog or exactly between the 
> lines. To use anything other than the 21 step you'd have to come up 
> with a way to map your step to a particular position in the PS
curve.
> 
> I'd be nice if Photoshop provides a way to customize the curve 
> dialog. However using a single dialog design it's easier for people 
> to share and modify curves.
> 
> --nick
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Pieris 
> Berreitter" <pieris@y...> wrote:
> > 
> > Technical question. I've got this 21step.tif file and I'm dying to
> > know why the steps are in 9% increments. Step wedges that I
create 
> > by hand (gradient, blur, posterize=21) give 5% per step. All this 
> > time I was printing this image out and I thought I was getting 5% 
> > per step, and I'm not.
> > 
> > I'm just trying to do my own profile for BO printing, since
nobody 

> > has offered one. Can anyone give me a reason to continue using 
> > 21step.tif?
> > 
> > -Pieris
> > digital darkroom blog: http://www.pmb.net/darkroom