Thanks for that. Good point about AbsCol. I hadn't considered comparing
AbsCol simply because I don't use that intent for printing photography -
either RelCol or Perceptual. But excellent point for "apples to apples"
RE UV/brightener skew, I used the DTP-70 with the UV filter engaged for both
software packages so that should be "apples and apples".
RE curves, I used the same curve for both - MaxK for Gretag, and the same
straight line for Monaco.
Of course, I guess it just comes down to Gretag weighting something else as
a little more important than neutrality in the RelCol intent calculations.
My understanding of the RelCol rendering intent led me to believe I should
have seen closer results from the two packages.
Good point about v4. Unfortunately, the Coloshop X tool doesn't display the
neutrals analysis graph or data for v4 profiles. Ugh.
The whole Monaco reversal thing still bugs me. I mean, given the same data
(RIP setup, etc.), Gretag produces a neutrals curve with a nice rounded
shoulder, leveling off to a very slight slope such that output for L*0 is
slightly darker than L*1, etc.... while Monaco has this "hump" at dMax, then
gets lighter from there down to L*0.
> Well if you really want to compare apples to apples then you shouldn't be
> looking at the rel col intent. Instead you should be evaluating the abs
> intent. The relative colorimetric intent is scaled to make whites look
> and depending if you used a Gretag or X-Rite device and if had the UV
> engaged will skew this table. I.e. Did you correct for optical brighteners
> in Gretag? X-Rite doesn't have this option instead relying upon the device
> to filter out UV content.
> So if you really want to compare one product to the next look at the
> col table which is basically the measurement data. Incidentally, v4 ICC
> profiles are supposed to resolve this ambiguity in the rel table as some
> manufacturers would adapt the data for that rendering intent while others
> Lastly, you are going to have different neutrals built by both
> because you will not be able to create a custom curve in Gretag only
> a GCR 1-4 while Monaco allows you to create a custom black curve. Both
> products will build neutrals differently because of it even if you select
> the same black start and similar curve shape. US versus Swiss neutrality!
> Have fun!
> Dan B. Reid
> Color Management Products & Training for Print, Internet, & Motion
> http://www.rpimaging.com | Toll Free: (866) RGB-CMYK