EXTRAS/TOOLS
============

   - Initialise grey-scales
     ----------------------

     This function allows resetting of all greyscale tables (COLORIZE)
     to their initial values. This may be useful when having changed
     these via CONFIGURATION/GREYSCALES but wanting to get the original
     colours back. Those palettes changed via CONFIGURATION/GREYSCALES
     will then be lost.

   - Colour filter
     ------------

     A menu appears which allows manipulation of the current
     thumbnail colours. Contrast, gamma, brightness as well as red,
     green and blue adjustments are available.

     The single buttons have the following functions:

        Use:       Takes the changed palette. It will only be available
                   temporarily and be overwritten when loading a new
                   catalogue or leaving the program.

        Default:   Resets the colours back to the settings being active
                   before entering the colour filter context.

        Save:      Saves the current modified palette. With greyscaled
                   catalogues it is available as USER2, with coloured
                   catalogues it is be saved under USER1.
                   COLORIZE and PROGRAM/COLORPALETTE allow a selection
                   of these.

        Cancel:    Leaves the menu without taking any of the changes.



