By using the „calculate“ function a colour graduation scale is automatically created, i.e. after defining a starting and an ending colour the graduation is calculated and inserted by the program. To do so, define the starting and ending colour as described in the „colours“ section. Afterwards, first click on the starting colour and then while holding down the CTRL-key on the ending colour. All colour squares between those marked by a box will be filled with a calculated colour, click on the „calculate“ button. The intermediate colours are now automatically calculated.