Re: 'The Shape of Colour' for Inkjets
Re: 'The Shape of Colour' for Inkjets
- Subject: Re: 'The Shape of Colour' for Inkjets
- From: "email@hidden" <email@hidden>
- Date: Tue, 23 Jan 2001 10:43:08 +1100
I have found that the grey color within my test image will posterize
"break-up issue", once the black weight is pushed over 7.0 and the black
start is also over 70 when building profiles within ColorBlind.
I have put a quick html page at
http://homepage.mac.com/darrinsouthern/ to
try to illustrate where the grey changes to almost purple ( the "break-up
issue"), and the heavy black screen is at it's finest, although it's still
there. It is not there at all on the BEST profiles
(I was incorrect in my first post about the 'canned profiles having the
black screen - apologies to the BEST techs)
I will be building profiles with PrintOpen 4.0 Mac (my PC spits the dummy
when I try to calibrate my DTP41 with PrintOpen 4.0 PC) next, to see how
PrintOpen 4.0 has changed it's black generation since version 3.
Darrin.
On 23/1/01 12:16 AM, "email@hidden" <email@hidden> wrote:
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Starting your black curve at 0 will speckle black ink into your light colors;
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starting it at 70% will only add black to dark tones. This is typical with
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inkjets, and should not be a problem. What are the "break-up" issues that
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this is causing?
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C. David Tobie
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Design Cooperative
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email@hidden
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In a message dated 1/22/01 2:24:06 AM, email@hidden writes:
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> On the 'MY 70% K Theory' settings, I am down to 5% of the colors (patches)
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> with the black screen, but my deep black areas begin to break up.
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>
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> The incorrect colors are where the 10% black is applied to the smaller
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> values of the CMY. In ColorBlind it it is the 1R 33 to 1a 41 on the 1441
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> patches tests. When these profiles are used within the BEST RIP, they also
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> appear with the heavy black screen over the light colors.
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>
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> I have also realized that the 'canned' profiles that come with BEST 4.2.1
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> also have this unattractive black screen, although it is only in a small
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> number of colors, and I wonder if the BEST RIP can actually send the printer
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> the correct data.
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>
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> Can anyone shed any light on this issue ?