4- Colour Printing

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Benefits of stochastic screening

• In general
  • Screen angles and moiré patterns are eliminated
  • Greater image detail is provided
  • The lack of screen rulings and screen angles leads to a significant improvement in image quality

   

• Maps -
  • Improved legibility for thin lines especially for contours
  • Improved legibility for small objects
    

Stochastic screening

Stochastic uses random dot placement, hence varying spacing between dots. Dots are the same size and shape inmost versions.
Stochastic screening involves imaging dots on film using special randomizing software.
The software uses mathematical expressions to statistically evaluate and randomly distribute pixels under a fixed set of parameters.

International Specification for Orienteering Maps produced by the International Orienteering Federation
OCAD produced by Hans Steinegger Software. © 1988-1999 Hans Steinegger. ® OCAD is a registered trademark of Hans Steinegger
This document has been written and coded by Peter Hornsby of Ashby Mapping
Apologies for any mistakes and errors; please inform details of any problems, thanks.
Produced for the Ashby Mapping internet site on 20 November 1997 and 1 December 1999  ©1997-2000 Ashby Mapping
Revised 28 December 1999, 23 March 2000

Extracted from the 1999 report by Knut Olav Sunde ISOM/2000 Project Team