Re: Ink limiting and black generation
Re: Ink limiting and black generation
- Subject: Re: Ink limiting and black generation
- From: Henrik Holmegaard <email@hidden>
- Date: Tue, 13 Feb 2001 10:46:58 +0100
Because I don't know what I'm talking about except wrt stuff I've
worked with, here goes:
Steve Upton <email@hidden> wrote:
If you can, ALWAYS setup a RIP to have appropriate ink limits and
make it as linear as possible prior to profiling.
Yes, density control comes before color control.
There are at least two approaches to ink limiting and linearisation.
a. The printer limits ink itself. The bigger HP printers limit ink
and linearise internally using a built-in densitometer. For each
paper / ink combination there is a 'Media Setting' that controls the
drops. This technology is available to third parties now. It gives
good differentiation between patches in the color space when you run
a testchart.
b. If you don't have a printer that limits ink internally, you can
linearise in a third party RIP which may or may not work with the
printer firmware. In this case the trick is to get the pure colors in
the testchart as they define the gamut volume.
Jan-Peter Homann <email@hidden> wrote:
As I understand the BEST-Software, the reducing of total ink to 180%
is doing a
internal GCR in the RIP. In the internal Dataflow of the RIP, this GCR is
applied after the color transformation by the profiles.
Try to print the testchart with the highest amount of total ink, even if the
dark colors in the testchart have no stabil borders. Choose now the total
amount of ink low as necessary in the profiling software with a very short
black for the profile of your media.
That's the recommended approach. The profiling software may return a
prompt that an internal algorithm will try to sort out the closely
bunched color patches.
--
Henrik Holmegaard
TechWrite, Denmark