1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
package main
// This example showcases how the interfaces Ditherer implements can be easily
// used to encode a full color image as a GIF, which can only use 256 colors.
import (
"image"
"image/color"
"image/gif"
_ "image/png" // Imported for decoding of the input image
"os"
"github.com/makeworld-the-better-one/dither/v2"
)
func main() {
// Create the kind of Dither we want
palette := []color.Color{
color.Black,
color.White,
color.RGBA{255, 255, 0, 255}, // Yellow
}
d := dither.NewDitherer(palette)
d.Mapper = dither.Bayer(8, 8, 1.0) // Why not?
// GIF settings - all of these are required!
opts := gif.Options{
NumColors: len(palette),
Quantizer: d, // dither.Ditherer fulfills both these interfaces!
Drawer: d, // How useful!
}
// Open an image and save it as a dithered GIF
f, err := os.Open("../../images/input/peppers.png")
if err != nil {
panic(err)
}
defer f.Close()
img, _, err := image.Decode(f)
if err != nil {
panic(err)
}
f2, err := os.Create("../output/gif_image.gif")
if err != nil {
panic(err)
}
// The GIF encoder calls on the Ditherer itself, because it's the Drawer in
// the GIF options.
err = gif.Encode(f2, img, &opts)
if err != nil {
panic(err)
}
}
|
