Re: measuring double trouble
Re: measuring double trouble
- Subject: Re: measuring double trouble
- From: Joel <email@hidden>
- Date: Fri, 2 Mar 2001 17:43:54 -0600
on 3/4/2001 11:17, Al Salam Publishing House at email@hidden
wrote:
The manual
states that liniarzation files can be modified for use with other
custom made
profiles but tells very little how this modification is done. Is there a
target that can be printed out for each color and then read back in with a
> measureing device such as the X-Rite DTP-22?...
Neil Snape wrote:
In theory you can linearize before profiling but so far you have to print
out a target and reduce your inks by hand until there is graduations in all
the tones up until black.
Not the Best DE question, but a question on linearizing and ink limits:
Reducing individual ink channels? Density?
Currently I print a density swatch 21 steps in %5 increments. I print
an ink limit swatch 20 steps in %5 increments. Both using
ColorProfiler in Scanvec-Amiable's PhotoPrintServer v2.5. The same
software which wrote the canned profiles provided with RIPS for the
Roland HiFi/Cammjet printers and line of media promoted by Roland.
On matte canvas and a number of watercolor papers (printer
manufacturer endorsed) if I choose ink limits visually on the
bleeding edges theory (put forward by the Scanvec-Amiable manual)
saturation, brightness and color accuracy diminishes considerably.
Also if I choose anything less than 0 ink limit on any channels,
regardless of any or no density alterations, I begin to loose color
accuracy in the form of heavy cyans/blues shifting to magenta tints,
and light greens diminishing to cyan/blue tints. When I try to
linearize and characterize for double printing on canvas or art paper
the problem increases exponentially.
In turn, when I print my density swatch, measure the table in
Tdensities, spreadsheet the numbers, choose my Tvalues on the basis
of maximum density before the primary in each ink channel begins to
diminish, choose my ink limits on this basis and then print either
ink or density swatch with the ink limits applied, the swatches
visually look appealing in some channels while others have no punch
at all. Each channel (CMYKOG) has a different peak density. The ink
limit primaries (cmykog) are simple enough percentages to figure out.
The M+Y, C+Y, C+M, C+M+Y, two ink, and three ink percentages have me
wondering. (There was no manual with my upgrade from 2 to 2.5)
So, on the linearization question, does anyone have any hard and true
formulae for picking ink limits and densities for materials which
really soak up the ink? Is it really a visual guessing game when it
comes to ink limits? Densities? Or does the old densitometer vcmy
actually have a function that maybe I'm missing?
I'd prefer a technical solution if there is one. Is there one?
--
joel johnstone - designtype
Winnipeg Manitoba Canada
email: work: email@hidden
color geek in residence, reality notwithstanding