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HP Indigo WS6000 Digital Press - Workflow for full color calibration and substrate-related parameters

The full color calibration process updates the job look-up table (LUT). These tables reflect the current press performance with regard to print quality. The LUT results may not be suitable for use if the LUT generation is performed in non-optimal, or unstable conditions. You should therefore verify print quality before performing the full color calibration. Verify the following for best results:
  • The first transfer is adjusted properly.
  • The substrate you are using is a well defined (type and thickness) calibration substrate, or is attached to one.
  • No print quality defects exist—such as voids, streaks, or stains.
Because of potential variability in the results, you should avoid performing a full color calibration on a blanket having less than 3,000 impressions.

Workflow

To set a calibration substrate, perform the following:
  • Define one substrate as a calibration substrate. Attach all the other substrates to this calibration substrate.
  • Allow automatic calibration to be performed.
  • If automatic calibrations are bypassed, perform full color calibration on the calibration substrate and all used screens on a weekly basis
    note:
    Do not perform a color calibration within a job. This can cause the color to change within a run.

Viewing last color calibration generation

The Color Calibration Status button in the Print Quality Panel displays the last color calibration results.
Figure : Color Calibration Status

Determining substrate type and defining optical density values

To determine the substrate type and define optical density values: This procedure enables you to determine the substrate type (glossy, semi-matte or matte) and to define optical density values for different substrates, including plastic and transparent substrates.
  1. Load a well defined substrate in the press. A high gloss substrate should be used. However, if it is not available, use another substrate whose type is known (gloss, semi-matte, matte) and defined.
  2. On the Main menu, select Print Quality. The Print Quality Panel opens.
  3. Touch Color Calibration. The Color Calibration wizard opens.
  4. Select Full calibration type, and run it Step by Step.
    • In the Substrate step, select the required substrate (the most used substrate on the press).
    • In the Method step, select Custom method, Use V-electrode, and Start with default parameters.
      Figure : Color Calibration Wizard — Method
  5. Run the wizard and make sure that all colors pass the color adjustment procedure. Touch Finish.
  6. Load the required substrate on the press. Any unknown substrate type should be attached to the calibration substrate in the substrate list.
  7. Print 10 copies of the CATP job.
  8. Measure the solid patches (J area) in the 9th and 10th copy of the CATP printout. Make sure to measure on a white background, and calculate the average values. Note these values.
  9. Check the measured values for each ink and compare to the values specified in the following table (note that the specified gloss values are correct only for paper substrates):
    Substrate gloss level
    Yellow
    Magenta
    Cyan
    Black
    Orange
    Violet
    Green
    Matte (0 < gloss < 12)
    0.9
    1.1
    1.1
    1.2
    1.3
    1.1
    1.1
    Semi-matte (12 < gloss < 25)
    1.0
    1.3
    1.3
    1.5
    1.65
    1.3
    1.3
    Glossy (glossy > 25)
    1.1
    1.45
    1.45
    1.75
    1.9
    1.45
    1.45
  10. In the table, find the substrate type that most closely resembles the measured solid optical density values.
  11. Touch Main Menu, Substrate, and Substrate List. The Substrate List opens.
  12. In the list, select the required substrate, then touch Properties, and Edit. The Substrate Properties window opens.
  13. Touch the Color Control tab.
  14. In the Gloss level field, select the gloss level that matches the measured solid optical density values (gloss, semi-matte, matte). Touch OK.
    Figure : Substrate — Color Control
  15. Re-run the Color Calibration wizard.
  16. Select Full calibration type, and run it Step by Step.
  17. In the Method step, select Custom method, Use V-electrode, and Start with default parameters.
  18. Follow the wizard instructions to complete the calibration procedure. Make sure that all colors pass the color adjustment procedure.

Exceptions

If high color accuracy is needed, the exact solid optical density values should be documented and changed whenever the substrate is installed in the press.
  • Do this by touching the Setup button in the Short Color Calibration wizard or the Full Color Calibration wizard.
  • The regular definitions (gloss, semi-matte, matte) are usually sufficient for best color performance.
If the color adjustment fails when adjusting the 100% optical density values, verify that the ink parameters are correct (density, conductivity, temperature).
  • Where the ink parameters are correct, and the color adjustment fails when adjusting the 100% optical density values, the problem is probably associated with the substrate type definition.
  • If the developer voltage is too low, select a glossier substrate type, if it is too high, select a less glossy substrate type.

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