Grass_Image_RGB2HISService - This service converts an image from the red-green-blue (rgb) space into the hue-intensity-saturation (his) color space. Each output raster map layer is given a linear gray scale color table.
Operations:
rgb2HIS - Processes three input raster map layers as red, green and blue components and produces three output raster map layers representing the hue, intensity, saturation of the data.
