Digital BW, The Print

pdesmidt tds.net <pdesmidt@...> wrote:

> **
>
>
> ... 7600 ... Eboni ...
>


> QTR calibration page on Arches and HPR. The prints
> air-dried for an hour or so, and then I hit them with a hair dryer for
> about 5 minutes. I believe the dmax of the Arches should increase over
> night.
>
> I used a Spyder Print spectro to measure densities, using a piece of
> natural white mat board under the print.
>
> The Eboni + Arches yielded a max density of 1.57.
> The Eboni + HPR yielded a max density of 1.62.
>
>
The Arches dmax looks rather normal.  I've only read over 1.6 with Arches
when printed with a 1400.  The 7600 does not appear to suffer from the
sub-normal dmax I'm seeing on the 4000.

The HPR dmax seems lower than I would expect.

> I printed off another Ink Separation page in QTR's calibrate mode. This
> time, I centered the image and used the "scale to fit" box. This gave
> bigger squares to measure. After hair drying for 5 minutes, the highest
> density square for the Arches read 1.70, quite a jump.

1.7 on Arches is a bit hard to believe.  Are you sure that was not the HPR?


dpgoldenberg33 goldenberg@... wrote:

>  Just to put some perspective on this:

> D=1.57 means that 2.7% of the light striking the paper is reflected.
> D=1.7 means that 2% is reflected.

> This difference is probably at the edge of what can be measured
accurately or detected visually (by my densitometer or eyes, anyway).

That is an interesting perspective.  I find that as long as I get about
1.57 on Arches they look fine in indoor display.  With very bright lights
the differences become more visible.

Paul
www.PaulRoark.com


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