Digital BW, The Print

Hello David,

When you mention "max out" you are on the right track. The ink that 
is laid down will reach a point the paper can not any longer absorb, 
but will be laid down on top of the absorbed ink. This can cause a 
sheen to appear when you hold it so the light can reflect off. When 
you run the black point test strip, there will be one section of all 
the black sections that will let you see a recognizable difference 
from the one just before and just after it. That is the BLACK POINT 
the paper can no longer handle any more ink. It is the maximum black 
that ink/paper combination will handle. Mine happened at 19 for the 
black and 253 for the white. I'm still deciding on the white point at 
this time. Hope this clarifies it some for you about the changes to 
make in the output numbers. On the curve 0=19 and 255=252 with the 
anchor points 90=90 102=102 114=114 and  179=179 191=191 and 204=204. 
This is the settings I use to set the black/white points, which gives 
me full tonality of the image. This is done after all the work on the 
image is completed. There is no noticable change visually to the 
image on the screen after applying the BP/WP settings. This is a 
separate curve applied at the very end of all the work done.

Your friend in Photography,

Johnny




--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "David 
Wroblewski" <dawroblewski@y...> wrote:
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Johnny Eades"
> <jeades1@s...> wrote:
> > ... Go to > www.zuberphotographics.com and download the Black
> > Point/White Point > information for the printer. Do the procedure 
> > to determine what Black > Point is needed to allow you to print 
> > a full tonal ranged image, and then do the procedure for the 
> > White Point to do the same thing. You may be surprised what this
> >  simple procedure can do for your printing results. I found that 
> > I had been using the Zero point to indicate my black point and 
> > after doing the BP/WP I now use BP=19 and WP=252. Do this test 
> > on all the types of paper you use.
> >  
> 
> I checked out the zuberphotographics pages you reference. 
> Interesting.
> 
> I have a longstanding point of confusion over whether I should 
> be setting the output sliders for black and white point (I always
> leave them at 0/255). This has only gotten worse with the advent of 
> QTR and IJC. Both those systems allow you to calibrate the point 
> at which each ink maxes out on the paper, and also to linearize a
> profile. Doesn't that mean that one would always leave the 
> output sliders at 0/255? Ie, doesn't the IJC/QTR curve already 
> perform this function?
> 
> -david