Digital BW, The Print

Paul Roark wrote:

>I've placed some comparison images of 4800 and 2200 UT7 reflections on my
>web page, accessible directly at
>http://home1.gte.net/res09aij/4800-2200-Reflections.html or from the bottom
>of my index at http://home1.gte.net/res09aij/index.htm .
>
>I wish there were a more scientific way to measure reflective artifacts, but
>this is what I have at the moment.
>
>Paul
>www.PaulRoark.com 
>
>
>  
>
There are but for that you have to go to the paint industry etc. 
Ulbricht Sphere, 45 degrees deflection and variable angle. Spot reading 
of uniform surfaces though.
An old scanner with the glass removed and the lamp and sensor 
repositioned (strip mirror at another angle) could be a solution. 21 
greyscale target print clamped on a metal mask where the glasplate was. 
Reading the strip over the length to keep the same lens angle. Have to 
ask the boys whether the old Scanjet is still used.
A Canon 350D :-) with a long lens facing a print at 45 degrees and a 
bare lamp at the same distance and opposite angle.

You may need a 21 step target with black and white lines running through 
it as the contrast edges seem to play a role in normal pics too, call it 
gloss accutance. The varnished target that I have here has an embossed 
black patch so to speak. The black needs more grey ink boost.

For ink limit checks it is better to have a target with thin contrasty 
lines in it anyway. But not where the density is measured.

Ernst