//docs/MPImage.doc/MPPalToGrey

   NAME   
  MPPalToGrey -- Convert palette image to GreyScale (V7)

   SYNOPSIS
  MPPalToGrey(Width,Height,pal,chunky,nPlanes,camg,Linear);
              D0    D1     A0  A1      D2     D3   D4

  void MPPalToGrey
             (UWORD,UWORD,UBYTE *,UBYTE *,UWORD,ULONG,BOOL);

   FUNCTION
  Convert palette image to GreyScale.

   INPUTS
  Width    - Width of image.
  Height   - Height of image.
  pal      - The current palette. This is a 768 byte array.
             [0] to [...] hold the Red palette
             [256] to [256+...] hold the Green palette
             [512] to [512+...] hold the Blue palette
  chunky   - The current chunky pixels.
  nPlanes  - The number of planes in the current palette.
  camg     - The camg of the current palette.
  Linear   - If True then map linear,
             otherwise give more weight to Green.

   RESULT
  The data pointed to by chunky is updated to the GreyScale pixels.

   EXAMPLE

   NOTES
  nPlanes and camg are required to cater for EHB and HAM.

   BUGS
  Not tested.

   SEE ALSO
  MPPalToRGB().