Twelve custom colours can be stored in the User palette. These colours can then be selected anywhere a colour can be set, including in the Colour Source node.
To add a colour to the User palette:
The colour is added to the next free slot. If all slots are already filled, the new colour is added to the first slot and all colours ripple down the chain, meaning that the colour that was in the twelfth slot is lost.
To replace an existing colour in the User palette:
Open the Colour Picker.
Set the desired colour by either sampling an image or using the colour sliders.
Select the User tab.
Enable Edit.
Select the colour to replace.
The selected colour is indicated using a yellow or red outline, depending on the current colour.
Click Replace.
To remove a colour from the User palette:
All twelve colours of the User palette can be saved in a file on disk. This makes it possible to create multiple palettes and load the one that is needed for a particular task.
To save a User palette:
Open the Colour Picker.
Select the User tab.
Click Save.
The Save Palette file browser is opened.
Select a destination path.
By default, the path is set to the directory associated to the current user profile.
Set a name for the file.
Click Save.
To load a User Palette:
Open the Colour Picker.
Select the User tab.
Click Load.
The Load Palette file browser is opened.
Select the path where the file is located.
Select the file to load.