NewRGBA
img := image.NewRGBA(image.Rect(0, 0, 200, 100))
img.Set(10, 10, color.RGBA{R: 255, A: 255})image
Core image types: Image interface, Rectangle, Point, and concrete types like RGBA / Gray / NRGBA.
Create an image
NewGray / NewNRGBA
gray := image.NewGray(image.Rect(0, 0, 64, 64))
nrgba := image.NewNRGBA(image.Rect(0, 0, 64, 64))Decode (format-agnostic)
Import the format packages for their side effects to auto-register decoders.
Decode any registered format
import (
_ "image/png"
_ "image/jpeg"
_ "image/gif"
)
f, _ := os.Open("input")
defer f.Close()
img, format, err := image.Decode(f)
fmt.Println(format) // "png" / "jpeg" / "gif"DecodeConfig (no pixels)
cfg, _, _ := image.DecodeConfig(f)
fmt.Println(cfg.Width, cfg.Height)Geometry
Rectangle / Point
r := image.Rect(0, 0, 100, 50)
r.Dx() // width
r.Dy() // height
r.Intersect(image.Rect(50, 0, 150, 100))