Contour Color Generation

If the Format option is Custom, the user can specify the method of colour generation (the colour generation methods correspond to the Auto-Format options, except that the user can change the Number of Intervals and the Minimum and Maximum colours ).

• Distinct -- the user can only change the Number of Intervals. The sequence of colours will simply repeat if more than 7 intervals is used (DOS-style), or more than 14 intervals is used (16-colour style).

• Alternate -- the contouring will alternate between the two (Minimum and Maximum) colours.

• Interpolate -- the contouring method will interpolate between the Minimum and Maximum colours, using the Method chosen (RGB, HSL Acute, HSL Obtuse). The interpolation methods are briefly described below.

RGB Method

Colours are defined in terms of RED, GREEN and BLUE components.

HSL (Acute) Method

Colours are defined in terms of HUE, SATURATION and LUMINANCE components. The Acute Method interpolates using the Acute angle between the minimum and maximum colours on the "colour wheel".

HSL (Obtuse) Method

Colours are defined in terms of HUE, SATURATION and LUMINANCE components. The Obtuse Method interpolates using the Obtuse angle between the minimum and maximum colours on the "colour wheel".