To define the colours please put the slide control below the colour scale on the desired number of colours. This is displayed in the centre below the scale. You can select values between 1 and 64. Now each single colour needs to be defined. To do so, double-click in the colour field to be defined and the Windows colour dialogue box appears. On the left you can choose the desired base colour by clicking on it. If necessary, this can be varied manually by using the quadratic colour spectrum or the lightness graduation to the right. The current colour is displayed in the field „colour/basis“. If the desired colour is chosen, click on „add colour“ and the colour appears in the first box of „user-defined colours“. Then click on „OK“, and the colour is entered in the colour scale. You need to repeat this procedure for every single colour box (alternatively, see „calculate“).