Black Generation and the Epson Inkjets Summary (2)
Black Generation and the Epson Inkjets Summary (2)
- Subject: Black Generation and the Epson Inkjets Summary (2)
- From: Darrin Southern <email@hidden>
- Date: Wed, 14 Feb 2001 18:07:32 +1100
Dear List Members,
I would like to thank all involved in this thread, as it has helped defined
a lot about Black Generation to a number of us who are trying to get the
BEST rip to give the type of result that the Epsons are capable of.
I have collated the recent posts into one, for others to follow, although my
first reply was rejected due to the 5 KB size limit, so I have cut out some
posts, sorry if the first one does actually get through.
I would recommend anyone following this thread to re-read Henrik's previous
posting on 'Inkjet profiling ABC', as this defines 'Black Generation'
BTW Henrik, what did you mean here in an earlier post:
>
Because I don't know what I'm talking about except wrt stuff I've
>
worked with, here goes:
>
Jan-Peter wrote about the issue of reducing the total ink in BEST :
>
>
> 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.
>
Henrik Holmegaard wrote also on the total ink issue:
>
>
That's the recommended approach. The profiling software may return a
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prompt that an internal algorithm will try to sort out the closely
>
bunched color patches.
That goes against what is in the manual from BEST.
They instruct for the BaseLine to be completed, then the 'QualityofColors',
which for semi-gloss, BEST build 180% into the profile with ProfileKeeper.
I totally agree with Henrik and Jan-Peter. Why limit the inkjet set up, when
all you really want is a 'signature' of what colours it can print, without
having to deal with the GCR issues and the 'dodgy black stiple'
The Epsons have a very large gamut, so why not use it !
>
Jan-Peter Homann also wrote the following about the linearisation feature:
>
>
As I described in my last answer, I would try to print with the highest
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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.
Are you talking about the Printer BaseLine or Printer linerisation, or some
other feature of the software. I know of three options :
1. When building a Printer BaseLine, the 30 odd charts are read,
and then you set the max ink limits for each of the channels,
then you see the curves.
2. The Printer Linerisation is build u=on top of the BaseLine, to define
if your epson printer can print the predefined values sorted in the
BaseLine.
3. If you just use the Enhanced screnning, you can then do a manual
linerisation for the four channels.
Which option are you recommending ?
>
I strongly recommend the profilekeeper from BESTColor. This programm writes
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the all the settings of BESTColor into the profile (linearisation,
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printquality, etc..) If you use such a profile in BESTColor, all the color
>
settings in BESTColor will be driven by the profile)
I don't think this information is written 'into' the profile, as I do not
believe this BEST information can be read 'outside' of the BEST software,
and these setting would not 'replace' those built into the profile by
PrintOpen.
I thought this 'extra BEST profile information' was built in with the
ProfileKeeper to ensure that when you change your profiles in the paper
window, the 'environment' in which the profile is build is set up too.