texturing

func AddRGB(colors ...color.Color) color.Color

func BoxBlur(src image.Image) image.Image

func BoxBlurNTimes(src image.Image, iterations int) image.Image

func Convolve(src image.Image, f func(x, y int, values []color.Color))

func GaussianBlur(src image.Image) image.Image

func MultiplyRGBByConstant(c color.Color, amount float64) color.Color

func ToNormal(src image.Image) image.Image