HP Indigo 7500 Production Handbook for Indigo 7000 Series Digital PressesTo fo - Page 11

should be done on HP SmartStream IN100 Labels and Packaging Print Server, Powered by Esko.

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● Calibrate single dot and line-work ● Measure 15 gray levels for each color ● Averaging with past LUTs ● Update Machine LUT Short color calibration - what does it do? ● Calibrate Auto Bias - change charge roller by measuring with electrometer ● Calibrate solids by changing the developer voltage ● Measure 3 gray levels (digital 6%, 14%, 40%) ● Estimate all other gray levels based on the 3 points measurement and previous Machine LUTs Initiating calibration - what does it do? ● Automatic initiation - automatic full and short color calibration are performed alternately every 10 K impressions, between jobs. (for jobs longer than 10K - the software searches for the end of job). ● Manual initiation - the operator can start the calibration from a wizard. Color calibration ● Full Color Calibration is more accurate than Short Color Calibration. Perform Full Color Calibration more frequently rather than performing Short Color Calibration. ● If the color consistency is acceptable, but an event recommends a color calibration, perform that color calibration between jobs or when a substrate is replaced, but not during a print run. ● On-press color matching tools should only be used for limited periods of time. The first option is to use the job look-up table (LUT). The second option is to use color matching bars. Other corrections should be done on HP SmartStream IN100 Labels and Packaging Print Server, Powered by Esko. ● The eye is the most sensitive tool for comparing colors. Be aware that colors may look the same under one light source but differ under another light source. Therefore, use the same lighting in the pressroom as in the proof-checking area. ● HP Indigo Solids Optical Density (OD) color specification for cyan, magenta, and yellow: +/- 0.05, for black: +/- 0.1. ● HP Indigo Dot Area (DA) color specification for cyan, magenta, yellow, and black: +/- 5%. ● HP Indigo Uniformity Solids Optical Density color specification for cyan, magenta, yellow, and black: less than or equal to 0.15 variation on the printed page. Color calibration (for presses with an ILD) 7

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●
Calibrate single dot and line-work
●
Measure 15 gray levels for each color
●
Averaging with past LUTs
●
Update Machine LUT
Short color calibration — what does it do?
●
Calibrate Auto Bias - change charge roller by measuring with electrometer
●
Calibrate solids by changing the developer voltage
●
Measure 3 gray levels (digital 6%, 14%, 40%)
●
Estimate all other gray levels based on the 3 points measurement and previous Machine LUTs
Initiating calibration — what does it do?
●
Automatic initiation - automatic full and short color calibration are performed alternately every 10 K
impressions, between jobs. (for jobs longer than 10K - the software searches for the end of job).
●
Manual initiation – the operator can start the calibration from a wizard.
Color calibration
●
Full Color Calibration is more accurate than Short Color Calibration. Perform Full Color Calibration
more frequently rather than performing Short Color Calibration.
●
If the color consistency is acceptable, but an event recommends a color calibration, perform that
color calibration between jobs or when a substrate is replaced, but not during a print run.
●
On-press color matching tools should only be used for limited periods of time. The first option is to
use the job look-up table (LUT). The second option is to use color matching bars. Other corrections
should be done on HP SmartStream IN100 Labels and Packaging Print Server, Powered by Esko.
●
The eye is the most sensitive tool for comparing colors. Be aware that colors may look the same
under one light source but differ under another light source. Therefore, use the same lighting in the
pressroom as in the proof-checking area.
●
HP Indigo Solids Optical Density (OD) color specification for cyan, magenta, and yellow: +/- 0.05, for
black: +/- 0.1.
●
HP Indigo Dot Area (DA) color specification for cyan, magenta, yellow, and black: +/- 5%.
●
HP Indigo Uniformity Solids Optical Density color specification for cyan, magenta, yellow, and black:
less than or equal to 0.15 variation on the printed page.
Color calibration (for presses with an ILD)
7