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    Information regarding recent vulnerabilities

    HP is aware of the recent vulnerabilities commonly referred to as "Spectre" and "Meltdown". HP has published a security bulletin with patches for these issues and a list of impacted systems. We will continue to update the bulletin as more information becomes available and encourage customers to check the bulletin frequently.

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HP Indigo WS6000 Digital Press - Defining substrate-related color parameters

Different substrates can produce different color results. The ability to perform press LUT generation and color adjustment for each substrate increases the color accuracy for different substrates. Color calibrations can be performed on almost all substrates.
Optical density of substrates
The optical density can vary between substrates even when using the same press parameters (such as laser power and developer voltage).
A densitometer gives a lower reading on matte substrates, compared to glossy substrates, although these substrates can appear identical to the human eye. Based on the densitometer reading, the press adjusts the printing to a lower density on matte substrates than on glossy substrates.
You can define the optical density for each substrate by selecting the correct substrate gloss level:
  • Matte (0 < gloss < 12) - represents a group of uncoated and high-matte substrates
  • Semi-matte (12 < gloss < 25) - represents a group of high-quality matte and silk substrates
  • Glossy (glossy > 25) - represents all glossy substrates
    The press calibrates the solid density according to the following table:
Substrate gloss level
Yellow
Magenta
Cyan
Black
Orange
Violet
Green
Matte (0 < gloss < 12)
0.9
1.1
1.1
1.0
1.3
1.1
1.3
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
  note:
The optical density calibration of HP Indigo Ink Mixing System (IMS) inks is specified in the HP Indigo Ink Mixing System file. Unlike other inks, the optical density of IMS inks does not change automatically when changing substrate type, so the optical density of IMS inks must be changed manually.
Defining a different substrate type (gloss level) automatically adjusts the optical densities.
To define substrate-related color parameters:
  1. Select Main Menu, Substrate, and Substrate List to open the Substrate List.
  2. Select a substrate and touch Properties, then Edit. Use the General tab to define substrate type, parameters, and unwinder core size.
    Figure : Substrate — General
  3. Use the Color Control tab to define color calibrations parameters and ink optical density. If you want the substrate to inherit color calibration parameters from a previously defined substrate, select Inherit color calibration from. Then select the previously defined substrate.
    Figure : Substrate — Color Control
  4. Use the Advanced tab to change substrate tensions, substrate heat resistance, set points, pretransfer heater settings, substrate conductivity, and the end of roll diameter.
    Figure : Substrate — Advanced

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