Name
  image:SetColorMask -- set transparent color
Synopsis

      status = image:SetColorMask(rmin, rmax, gmin, gmax, bmin, bmax)

Function
  `image:SetColorMask()` sets the transparent color of the image by the RGB range values. The color within the range is displayed as a transparent color. The image must be in RGB color space.

Inputs
  rmin
    the lower limit of red; it must be between 0 and 255
  rmax
    the upper limit of red; it must be between 0 and 255
  gmin
    the lower limit of green; it must be between 0 and 255
  gmax
    the upper limit of green; it must be between 0 and 255
  bmin
    the lower limit of blue; it must be between 0 and 255
  bmax
    the upper limit of blue; it must be between 0 and 255
Results
  status
    status code
Errors
  `#HPDF_INVALID_IMAGE` - An invalid image handle was set.

  `#HPDF_INVALID_COLOR_SPACE` - An image other than RGB color was specified.

  `#HPDF_FAILED_TO_ALLOC_MEM` - Memory allocation failed.

  `#HPDF_INVALID_PARAMETER` - An invalid value is specified.

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