-
Notifications
You must be signed in to change notification settings - Fork 0
/
RGB_Image.go
64 lines (49 loc) · 1.86 KB
/
RGB_Image.go
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
59
60
61
62
63
64
package main
import (
"fmt"
"image"
"image/jpeg"
"os"
)
func init() {
// damn important or else At(), Bounds() functions will
// caused memory pointer error!!
image.RegisterFormat("jpeg", "jpeg", jpeg.Decode, jpeg.DecodeConfig)
}
func main() {
imgfile, err := os.Open("./elephant.jpg")
if err != nil {
fmt.Println("elephant.jpg file not found!")
os.Exit(1)
}
defer imgfile.Close()
// get image height and width with image/jpeg
// change accordinly if file is png or gif
imgCfg, _, err := image.DecodeConfig(imgfile)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
width := imgCfg.Width
height := imgCfg.Height
fmt.Println("Width : ", width)
fmt.Println("Height : ", height)
// we need to reset the io.Reader again for image.Decode() function below to work
// otherwise we will - panic: runtime error: invalid memory address or nil pointer dereference
// there is no build in rewind for io.Reader, use Seek(0,0)
imgfile.Seek(0, 0)
// get the image
img, _, err := image.Decode(imgfile)
fmt.Println(img.At(10, 10).RGBA())
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
r, g, b, a := img.At(x, y).RGBA()
rr := uint8(r >> 8)
gg := uint8(g >> 8)
bb := uint8(b >> 8)
aa := uint8(a >> 8)
fmt.Printf("[X : %d Y : %v] R : %v, G : %v, B : %v, A : %v \n", x, y, rr, gg, bb, aa)
//fmt.Printf("[X : %d Y : %v] R : %v, G : %v, B : %v, A : %v \n", x, y, r, g, b, a)
}
}
}