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Printing

Printing. Classical printing techniques Letterpress Offset Gravure. New techniques. Ink-jet Thermosublimation, etc. Electrostatic laser printing. Three - color print. Patches of Cyan, Magenta, and Yellow Their subtractive mixtures: Red, Green, Blue. Remainder: White

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Printing

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  1. Printing • Classical printing techniques • Letterpress • Offset • Gravure

  2. New techniques • Ink-jet • Thermosublimation, etc. • Electrostatic • laser printing

  3. Three - color print • Patches of Cyan, Magenta, and Yellow • Their subtractive mixtures: Red, Green, Blue. • Remainder: White • The relative surface covered by these 7 colors: • AC, AM, AY, AR, AG, AB, AW, AK • The tristimulus values of the resulting color: • X=AC XC + AM XM + AY XY + AR XR + AG XG +AB XB + AW XW + AK XK • etc.

  4. To calculate the relative surfaces statistically average surface ratio c: covered by cyan, m: by magenta, y: by yellow AW = (1-c) (1-m) (1-y) AC = c (1-m) (1-y) AM = (1-c) m (1-y) AY = (1-c) (1-m) y AR = (1-c) m y AG = c (1-m) y AB = c m (1-y) AK = c m y Neugebauer equations

  5. Black as a 4th printing color • c m y not really neutral • Gray Component Removal (GCR) • Spare c, m, y ink

  6. Printing material (paper) • Surface quality • normal, • special, and • gloss paper • White grade • WCIE=Y+800 (x_D65 - x) + 1700 (y_D65 - y) • x, y, Y: the paper under D65

  7. Color gamut • gamut of the color print and that of the color screen differ

  8. Raster • Thickness of ink = constant • Raster: to create half tones • -Varying the sizes of the points • -Varying the distance between points • -Three - color print • (Ink Jet Technology)

  9. Raster production • 3 or 4 color separations of the original image • Rastering of the separations • Printing • PSL2: Raster Image Processor (RIP).

  10. Rastering of grey-scale • Wedge Raster Superposition

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