QTR-Quadtone RIP

rossfmj <ross.jarvis@...> wrote:

> **
>
>
> ... from Paul Roark's website;
> http://home1.gte.net/res09aij/21-Step_GG22_L5.tif (marked for Gloss
> Paper).
>
 I use the one at http://www.paulroark.com/BW-Info/21-step.jpg as it is
easier to read from left to right.


> Both of these show to not be linear in values for the graduations. Values
> I get (% and on 255 8Bit Luminance Scale) are;
>
> Black 100% is 100% (0), 95% is 98% (5), 90% is 92% (19), 85% is 87% (33),
> 80% is 81% (48), 75% is 76% ((62). The Luminance values do not match the
> figures on Paul's test strip.
>
If you look at the "Grayscale" values, which is an option in the Info
panel, do the values match the % markings on the test strips?  They do on
my system.  The RGB numbers of the test strip you noted also match the RGB
value in my Photoshop Info panel (except for 95% showing 13 instead of 12).


>
> Have these wedges been created with a conversion factor to open up the
> blacks in linearisation?
>

No.

Paul
www.PaulRoark.com


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