RGB Color
You can select an RGB color for a hatch.
You can freely select any RGB color by clicking on the color gradient in the dialog box. The selected color has a certain hue and saturation. You can adjust the color's luminosity with a slider.

- Hue
 - Select the hue from the color gradient area in the horizontal direction.
 - Saturation
 - Select the saturation from the color gradient area in the vertical direction.
 - Luminosity
 - You can select the color's luminosity by dragging the slider 
 with the cursor in the direction of the Y axis in the dialog
          box. Black and white are at the extremities of the slider. - Add to Custom Colors
 - Click this button to save the selected color in a separate Custom colors menu. You can define 16 different custom colors which are saved in the user/CUSTOMCOLORS file.
 

 If you adjust this property to
          completely black or white, changing the color's hue or saturation will have no
          effect.