Utility Functions
DrawBox Draws a rectangle on the input image
DrawCircle Draws a circle on the input image
DrawLine Draws a line on the input image
FillBox Draws a filled rectangle on the input image
FillCircle Draws a filled circle on the input image
GetWidth Gets the width of the input image
GetHeight Gets the height of the input image
GetChannels Gets the number of colour planes of the input image
GetPixel   Gets the colour of a pixel in the input image
RemovePixel Sets the colour of a pixel in the input image to black
SetPixel Sets the colour of a pixel in the input image
DoubleSize Doubles the size of the input image
HalveSize  Halves the size of the input image
MaskImg    Puts a black frame onto the input image
Point2Cross Draws a white cross everywhere there is a white pixel in the input image
Point2Square Draws a white square everywhere there is a white pixel in the input image
RotateImg Rotates the input image by a user defined angle
Rotatem90 Rotates the input image by minus 90 degrees
Rotatep90 Rotates the input image by plus 90 degrees
ScaleImg  Scales the input image by the specified x and y scales
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