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Blue

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This page contains content from Ashby Mapping    revision 01/00

Blue is used water symbols. Many symbols use blue.

There are three versions of blue in the default OCAD colour table:

Blue colour number 2 used by most water symbols

Blue 50% colour number 3 used by symbol Lake (301.0)

Blue 20% colour number 20 not used by the default symbols

Blue/Green colour clash

The problem with colour clashes is that the screen and composite (local printer) output does not necessarily reflect the separated output.

If you digitise your map in the same way as you would draw it, that is, you cut out all underlying objects beneath the blue, then there is no colour problem.

There are alternatives, the most common method is to make the blue colours automatically knockout the lower colours. To do this, you have to change the colour table.

  • OCAD5 Put a -1 in the blue row in each colour column that you want to knockout.
  • OCAD6+7 use a 0 (zero) instead.
    Only the colours lower down the colour table are affected. So there will be no effect on symbols using black and street colours.

    There are more details in the Main Help File or in the Colour Help file.

    The Pantone Matching System

    The Pantone Matching System is one of the colour models used by commercial printers.

    IOF Specifications define the following colours, their approximate CMYK (process colour) translations are given:-

    Colour Pantone Cyan Magenta Yellow K (black)
    Black Black 0 0 0 100
    Brown 471 0 56 100 19
    Yellow 136 0 28 79 0
    Blue 299 87 19 0 0
    Green 361 76 0 91 0
    Grey 428 0 0 0 23
    grey is usually applied as a tone of the black separation.

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    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