pkg image/color, var YCbCrModel Model
pkg image/draw, const Over Op
pkg image/draw, const Src Op
pkg image/draw, func Draw(Image, image.Rectangle, image.Image, image.Point, Op)
pkg image/draw, func DrawMask(Image, image.Rectangle, image.Image, image.Point, image.Image, image.Point, Op)
pkg image/draw, type Image interface { At, Bounds, ColorModel, Set }
pkg image/draw, type Image interface, At(int, int) color.Color