Reference

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x_select_palette

Arguments:

Description:

Open a RGB or RGBA color selector widget from a palette.

The palette is given as a selected image.
Argument variable_name specifies the variable that contains the selected color values (as R,G,B,[A])
at any time.
Assigning -1 to it forces the interactive window to close.

Default values:

variable_name=xsp_variable and number_of_columns=2.