HP Indigo WS6000 Indigo High Quality Color Control HQCC Process for PSPs and B - Page 46

Set Color Engine Pilot preferences, Density Filter (Density Formula)

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Table A-7 Measuring points per LUT curve (continued) Linear EXP_025 EXP_05 30 36.2 42.7 20 24.8 30.1 10 12.8 15.9 5 6.5 8.2 EXP_075 49.2 35.5 19.3 10.1 Chromalin 52.5 37.5 20 10 Set Color Engine Pilot preferences This section explains how to set Color Engine Pilot preferences. NOTE: The following sections expand on concepts / procedures mentioned in DFE - Requirements for standardization and process preparations on page 10 (under the Detailed Production Processes > Standardization > DFE chapter). Density Filter (Density Formula) The density filter is used by densitometers during a measurement to achieve a desired response. The goal is for the device to measure a neutral patch (gray or black). Since a spectrophotometer (SPM) measures light over a range of wavelengths, a Density Formula is used to calculate proper values. The table below shows the different formulas and their comparable ISO standards. Filter ANSI A ANSI T DIN DIN NB Application Notes Wide-band color reflection and transmission response; used mainly in the photographic industry for measuring prints and slides Wide-band color reflection response; used mainly in the US Wide-band color reflection response; used mainly in Europe; produces higher values for yellow than ANSI T / ISO STATUS T Narrow-band densitometer response; rarely used ISO Equivalent ISO STATUS A ISO STATUS T ISO STATUS E ISO STATUS I NOTE: This table is taken from the Esko Curve Pilot User Guide; for a direct link to the document, see in Related documentation on page 47. Refine Spot Colors: Delta-E Tolerance (General Preferences) "Out of Gamut" represents the required Delta-E tolerance. Spot colors will be labeled as such during the Spot Color Refinement wizard if the software is unable to achieve a Delta-E lower than this value. "Color on Target" represents the Delta-E value that the software will try to achieve during Spot Color Refinement. To achieve appropriate results, set the Color on Target value much lower than the Out of Gamut value. In the example below, the Delta-E tolerance is 2.0 with a refinement Delta-E target of 0.5. These settings mean that the software will attempt to refine all process spot colors to a Delta-E target of 0.5. The software will also attempt to refine any spot color outside of a Delta-E tolerance of 2.0. 42 Appendix A Appendix

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Table A-7
Measuring points per LUT curve
(continued)
Linear
EXP_025
EXP_05
EXP_075
Chromalin
30
36.2
42.7
49.2
52.5
20
24.8
30.1
35.5
37.5
10
12.8
15.9
19.3
20
5
6.5
8.2
10.1
10
Set Color Engine Pilot preferences
This section explains how to set Color Engine Pilot preferences.
NOTE:
The following sections expand on concepts / procedures mentioned in
DFE — Requirements for
standardization and process preparations
on page
10
(under the Detailed Production Processes >
Standardization > DFE chapter).
Density Filter (Density Formula)
The density filter is used by densitometers during a measurement to achieve a desired response. The
goal is for the device to measure a neutral patch (gray or black). Since a spectrophotometer (SPM)
measures light over a range of wavelengths, a
Density Formula
is used to calculate proper values.
The table below shows the different formulas and their comparable ISO standards.
Filter
Application Notes
ISO Equivalent
ANSI A
Wide-band color reflection and transmission response; used mainly in the photographic
industry for measuring prints and slides
ISO STATUS A
ANSI T
Wide-band color reflection response; used mainly in the US
ISO STATUS T
DIN
Wide-band color reflection response; used mainly in Europe; produces higher values for
yellow than ANSI T / ISO STATUS T
ISO STATUS E
DIN NB
Narrow-band densitometer response; rarely used
ISO STATUS I
NOTE:
This table is taken from the
Esko Curve Pilot User Guide
; for a direct link to the document, see
in
Related documentation
on page
47
.
Refine Spot Colors: Delta-E Tolerance (General Preferences)
“
Out of Gamut
” represents the required Delta-E tolerance. Spot colors will be labeled as such during the
Spot Color Refinement
wizard if the software is unable to achieve a Delta-E lower than this value.
“
Color on Target
” represents the Delta-E value that the software will try to achieve during Spot Color
Refinement.
To achieve appropriate results, set the
Color on Target
value much lower than the
Out of Gamut
value.
In the example below, the Delta-E tolerance is 2.0 with a refinement Delta-E target of 0.5. These settings
mean that the software will attempt to refine all process spot colors to a Delta-E target of 0.5. The
software will also attempt to refine any spot color outside of a Delta-E tolerance of 2.0.
42
Appendix A
Appendix