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Halftone
Process using a series of dots of various sizes within a fixed grid to simulate shades of grade.
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Halo
Lightening of black ink when it is printed near another colour.
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Head Crash
Accidental contact of an inkjet nozzle or the complete head with a substrate during printing.
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Hexachrome
A colour matching system that allows the combination of 6 colours (CMYK, orange and green) in order to reproduce a larger gamut of colours; developed by Pantone Inc.
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Hi-Fi
6-colour printing used to obtain a more subtle rendition of light tones beyond that of traditional 4-colour processes by adding light cyan and light magenta.
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Hi-Fi Jet
Range of piezo inkjet printers made by Roland DG.
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Hot Lamination
Application of a clear layer to protect a print or other substrate; may contain UV-filters; uses heat to activate the adhesive and thus cannot be used on heat sensitive substrates. Prints must be completely dry before lamination to avoid bubbles due to trapped moisture.
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HSV
Hue, Saturation and Value; a colour model in which colour is described in terms of chromatic colour, its intensity and its variation from light to dark.
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Hue
One of the components of colour represented by angle of a 360° colour wheel.
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Humectant
Soluble component of inkjet inks that is used to preserve the moisture content of the inks.
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