Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale <stevekale@=
b...> 
wrote:
> Carl
> 
> As part of my continuing poking under the hood of QTR I printed the 21 st=
ep
> wedge file 21step.psd using firstly your 100% EEM cool then 100% warm (an=
d
> then also a curve using just the 27/27/56 LC/LM/LK mix you used to produc=
e a
> cool LK in order to see clearly the hue of the cooled LK).  In each print=
out
> there is on the top 1/3 part of the strip which has the smoothed transiti=
on
> a dark patch from 100 to say 97, ie at smooth transition abruptly stops
> around 97 and 97-100 is the same shade of grey.  I suspect that this shou=
ld
> not be the case ­ it is not that way on the screen.  What¹s causing this?=

> Is it simply that the two ends of this image are not part of the scale? ­=
 I
> note that when looking at the stepped (bottom) part of each image the 100=

> and 0 blocks are wider than the rest and the dark patch I see kicks in
> exactly 1cm to the left of the right side 100% marker (each 5% block bein=
g
> 1cm).  If this is the case I am surprised that the extra bit on the left =
is
> abruptly darker than where the 100% mark would be.
> 
> Can you also explain to me the second scale on this file ie 0-160.
> 
> Cheers
> 
> Steve
> 

Hi Steve,

I haven't seen the gradient so maybe Carl can comment on that.
In general though the 95-100 range has very steep curves in the black ink
so it is a hard area to deal with.

As far as the 21step image, the reason the 0 and 100 patches are slightly
wider is because Photoshop does gradients that way.  Do a gradient and
posterize, and that's what you get.  I always thought it strange, too.

The scale at the bottom of 0-160 is a little outdated, but it was target
densities when I was individually measuring patches and my dMax was 160.

Cheers,
Roy

BTW, I think it great for you to get up to speed understanding and making
profiles.  The more the merrier.  I find looking at the ink graphs to be th=
e
best way to understand what various changes do.

Roy