Re: BEST/Epson and Black Generation
Re: BEST/Epson and Black Generation
- Subject: Re: BEST/Epson and Black Generation
- From: Jan-Peter Homann <email@hidden>
- Date: Tue, 13 Feb 2001 17:48:29 +0100
Darrin Southern 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.
>
> Even if your profile for the proofing media is build without black, the
>
> internal GCR will cause the black dots in your print.
>
>
I am not getting black in the areas of the images that are pastels or silver
>
finishes (C:39 M:66 Y:95 K:11 and C:72 M:58 Y:67 K:29) when I build a 'No
>
Black' profile, but I do when I build a 'Skeleton Black' profile.
>
>
> 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.
>
>
This is the question:
>
>
Do you set up the BEST rip with the densities and total ink limits 'before'
>
profiling, which leaves the profile to do less work, (kinda like setting the
>
RGB guns in a monitor before profiling)
>
Or
>
Let the profile define do all the work, as with the Mach1 Rip ?
>
>
Darrin.
As I described in my last answer, i would try to print with the highest possible
amount of total ink, and let the profile do the work of the black generation.
But you should use the the linearisation-feature of BESTColor. A good profile is
only possible, when the testchart shows different colors in the 3/4 tone.
I strongly recommend the profilekeeper from BESTColor. This programm writes the
all the settings of BESTColor into the profile (linearisation, printquality,
etc..) If you use such a profile in BESTColor, all the color settings in BESTColor
will be driven by the profile)
Using Photoshop for controlling the black in profiles for proofing
--------------------------------------------------------------------------------
The following workflow I have not checked yet. But it should work. As BEST is
using ICC-profiles, you can do the same color transformations either in Photoshop
or in BESTColor. So you can use Photoshop to inspect the blackgeneration for
different profiles for your proofmedia.
Firstly you need the same profiles in your colorsync-folder, which you use in
BESTColor. Remember, that ICC-Profiles from Windows-Systems like BESTRef5.icc need
the correct Type Creator under MacOS.
You can use ResEdit or other Tools like ICC Type&Creator from Heidelberg to change
this.
Now take a critical CMYK-picture with fleshtones etc. and open it Photoshop.
Convert this picture from your Reference-profile (e.g. BESTRef5.icc) to Lab. Use
relCol, if you dont use paper-simulation in BESTColor or absCol if you want
paper-simulation.
In Photoshop 6 choose under "own view" (I use a german version...) the profile for
your proofing media and use also relCol or absCol depending on the paper
simulation. With the CMYK-colorpicker, you can now inspect the black generation
for every part of your testpicture.
If you are making profiles with different black generation in your profiling app.
, this way is much faster as making a testproof for every version of the profile.
:-) Jan-Peter
--
Jan-Peter Homann
mailto:email@hidden
http://www.colormanagement.de