Thumbnails
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  Here you can do all these adjustments which produces an impression on
  the pictures directly. You can decide between "ON", "OFF" and "INT"
  (interactiv).

Border
  Lays a boarder around the picture. You can decide between "ON", "OFF"
  and "INT". When the function was set to interactiv, you will be asked at each
  picture again if you want to lay a boarder around the stamp.

PixelAspect
  The picture will be reduced according to its proportion. When it is
  activ the picture will be reduced on the adjusted size even it follows
  a distortion of this picture. You can decide between "ON", "OFF", "INT".

Dither
  It switchs on the dithering mode which will optimize the quality of
  the reduced picture. When the mode was set to OFF the processing rate of
  the pictures will be higher. You can decide between "ON", "OFF", "INT".

BackgroundColour
  When PixelAspect is activated it can happens often that the stamps are 
  smaller than the pretended picture size. You can fill in the blanks with the
  chosed colour by using "Colour". You can decide between "GREY",
  (background colour), "BLACK" and "WHITE".

Category
  You can decide between "OFF", "INTERACTIVE", "AUTOMATIC". When the mode was 
  set to interactive you can choose the category for each picture.

Interpolation
  By using the interpolation function you wil receive a much more
  better quality of the thumbnails, that`s usefull for ClipArts.