package mainimport (	"image"	"image/color"	"image/draw"	"image/png"	"log"	"os")func main() {	rectangle := "rectangle.png"	rectImage := image.NewRGBA(image.Rect(0, 0, 200, 200))	green := color.RGBA{0, 100, 0, 255}	draw.Draw(rectImage, rectImage.Bounds(), &image.Uniform{green}, image.ZP, draw.Src)	file, err := os.Create(rectangle)	if err != nil {		log.Fatalf("failed create file: %s", err)	}	png.Encode(file, rectImage)}

编译输出: