• READ_RED("file"), READ_GREEN("file"), READ_BLUE("file")—Returns an array containing only the red, green, or blue component from a color image file, respectively.
• READ_HLS("file")—Returns an array containing a hue, lightness, and saturation representation of an image file.
• WRITE_HLS("file", M)—Writes the image matrix M to a 16-million-color HLS image file.
• READ_HSV("file")—Returns an array containing a hue, saturation, and value representation of an image file.
• WRITE_HSV("file", M)—Writes the image matrix M to a 16-million-color HSV image file.
• READ_HLS_SAT("file")—Extracts the saturation component from an HLS color image file.
• READ_HSV_SAT("file")—Extracts the saturation component from an HSV color image file.
• READ_HUE("file")—Extracts the hue component from an HLS or HSV color image file.
• READ_LIGHT("file")—Extracts the light component from an HLS color image file.
• READ_VALUE("file")—Extracts the value component from an HSV color image file.
Arguments
• "file" is a string containing the file name or the full pathname and the file name. Recognized image formats are BMP, GIF, JPG, PCX, or TGA.