Define custom colours and add them to the Custom colour palette.
Choose Format - Area, click the Area tab and press the Colour button. A table of the predefined palette colours is displayed.
Custom colours are saved in the Custom colour palette.
Click a colour in the table that is similar to the one you want to define. You can select the similar colour from any of the available colour palettes in the Colours area on the left or the Recent colours in the list below the colour table. The colour appears in the New preview box to the right of the dialogue box.
Click the Pick button to open the Pick a Colour dialogue box.
LibreOffice uses only the RGB colour model for printing in colour. The RGB values of the selected colour are displayed below the preview boxes.
Press the Add button to add the custom colour to the Custom colour palette. A dialogue box asking to enter a colour name appears. Enter a unique name for the new colour within all colour names existing in the Custom colour palette.
To remove a colour from the Custom colour palette, select the Custom colour palette in the Colours area, select the colour to be deleted and click Delete.