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
- Date: Mon, 22 Jan 2001 08:16:23 EST
In a message dated 1/22/01 2:24:06 AM, email@hidden writes:
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I have been making adjustments to the settings within Colorblind
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Professional 3.6, building profiles with the 1441 patches, and I have
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changed the setting from and to:
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Default CLOSEST MY 70% K Theory
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Total Dot 330 180 180
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Max Black 90 100 100
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Black Weight 7.0 5.0 7.0
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Black Start 0 0 70
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Greg GCR 0 0 0
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Color GCR 100 0 0
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Delta Average 1.92 1.15 1.33
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Peak 4.19 3.00 6.46
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Standard Dev 0.92 0.50 0.99
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I have changed the 'Total Dot' and 'Max Black' to match the settings used
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with the 'canned' profiles that came with the BEST RIP.
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Dropping the 'Color GCR' has enabled me to keep the density of colour in
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my
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black areas of the image.
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On the 'CLOSEST' settings I get the best Delta, but I get 90 of the patches
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printing correctly, although the other 10% print the targets with a heavy
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black stipple.
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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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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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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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Can anyone shed any light on this issue ?
Starting your black curve at 0 will speckle black ink into your light colors;
starting it at 70% will only add black to dark tones. This is typical with
inkjets, and should not be a problem. What are the "break-up" issues that
this is causing?
C. David Tobie
Design Cooperative
email@hidden