Presentation library New symbols introduced in s-52 PresLib
Displaying the Colour Test Diagram
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18.3 Displaying the Colour Test Diagram18.3.1 Introduction; providing the diagramThe colour generating capability of any type of display screen will deteriorate with age and the Colour Differentiation Test diagram is provided to enable the Mariner to verify that his display screen still retains the colour differentiation capability needed to distinguish between the various colour-coded areas, lines and point symbols of the ECDIS display. The diagram will not be true to colour unless it is projected on a calibrated monitor and is generated using the colour tables of Appendix A. Two methods of providing the diagram are: a) Use the S‑57 format file labelled “C1WOO” containing the Colour Differentiation Test Diagram, which is included on the Presentation Library distribution CD. This file shall be drawn so that the extent of the imaginary chart data covers the entire ECDIS display. Because the file uses pseudo-S-57 cartographic objects it shall be displayed using the special look-up provided for the digital ECDIS Chart 1. b) Use the graphics file illustrated in section 16.3 as a model. Based on this model, reproduce the same pattern of rectangles and lines on the screen, but present them in the correct colours using the colour tokens given immediately below and the colour tables of Appendix A. The diagram consists of twenty numbered squares extending over the whole of a 270 x 270 mm screen. Each square is coloured with one of the four main background area shades (such as shallow water blue, DEPVS), and each carries a two-pixel wide diagonal line in one of the important line or symbol foreground colours (such as planned route red, PLRTE). These are arranged as follows: Four main background colours:
Six important foreground colours:
Note: Remember that a tif, .pdf or other source will not be true to colour unless it has been specifically modified to access the colour tokens and colour tables used by the ECDIS. Although originally designed for use on CRTs, this test shall be extended to LCD and other screens. Download 48.59 Kb. Share with your friends:
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