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HP Indigo WS6000 Digital Press - Calibrating press colors

Editing job look-up tables (LUTs)

Job LUTs are used to change the printed dot size in relation to the dot size as defined in the original graphics files. By editing LUTs, you can control the dot gain for every dot size individually.
HP Indigo supplies several tailored LUTs, ranging from Linear to Chromalin, with Chromalin applying the biggest dot gain. You can also create your own LUT or set a customized LUT as the default.
Figure : Different LUTs
Dot size in graphic file
Printed dot size
To create your own LUT, select Job Properties, and then select the Color Control tab. Use the Table and Scales tabs to modify the entire LUT, or change selected points.
Figure : Job Properties - Color Control
LUT changes only apply to the selected job.
You can save the LUT to the LUT Library for use with other jobs.
You can control the 50 percent dot area from the job LUT panel.
To improve accuracy, adjust colors from the Color Control tab.
The solid, 100 percent optical density slider in the Job properties - Color Control window contains the same parameter adjustments as those in the Job properties - Color Match window.
Color matching is used when you need to change the color intensity. Color matching is a fast but less exact tool than LUT changes. With color matching, the entire gray scale shifts either up or down.
With color matching, you can define the new optical density value for the 100 percent dot area and for the 50 percent dot area for each ink individually. Move the job to the Held Job list before attempting to perform Color Match. These values are then saved as part of the job properties for future runs.
Figure : Job Properites - Color Match


Jobs can be printed with different screen rulings. The higher the screen ruling, the better the rendering of detail.
Higher screen rulings are more demanding, because they require a more finely tuned press calibration.
Job screen can be defined in the Job Properties window, Separations tab.
HP Indigo supplies the following screen rulings:
  • Sequin — an average of 144 lines per inch (lpi), used for specific circumstances only
  • HDI-175 — an average of 175 lpi — default screen used for most jobs
  • HDI-180 — an average of 180 lpi
You can print a separation several times to enhance density.
HP Indigo supplies you with alternative color order to support transparency printing.
To define how the press handles white ink, from the White ink style drop-down list, select an option. This determines the number of null cycles.
Figure : Job Properties - Separations

Inks “double-hit” printing

Some Ink Mixing System inks require double-hit printing in order to achieve the required color saturation, and this feature performs double-hit printing without screening artifacts (patterns).
The press will double-hit only the solid and high-saturation gray levels.
Double-hit printing can be defined from the Job Properties window, Separations tab. Check the X2 box for the required color.

Web motion

Use this tab to change the repeat length and motion profile of the job.
Figure : Job Properties — Web Motion
Repeat length is set in HP SmartStream IN100 Labels and Packaging Print Server, Powered by EskoArtwork.
Motion profile is automatically set according to the number of separations.

Linework and resolution

Modify linework and resolution to print thinner lines and smoother fonts at a higher definition. Job linework and resolution can be defined in the Job Properties window, Linework and Resolution tab.
  • Check Adaptive Halftoning to smooth edges on gray-level areas
  • Check Line Smoothing to smooth lines in 400 dpi and 600 dpi jobs
  • Check Line Thinning and type a value in microns or use the slider to choose value
Figure : Job Properties — Linework and Resolution






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