def import(image)
      pixels = image.export_pixels_to_str(0, 0, image.columns, image.rows, "RGBA")
      ChunkyPNG::Canvas.from_rgba_stream(image.columns, image.rows, pixels)
    end
def import(image)
      pixels = image.export_pixels_to_str(0, 0, image.columns, image.rows, "RGBA")
      ChunkyPNG::Canvas.from_rgba_stream(image.columns, image.rows, pixels)
    end
Imports an RMagick image as Canvas object.
 @param [Magick::Image] image The image to import
 @return [ChunkyPNG::Canvas] The canvas, constructed from the RMagick image.