用GO扫描图片像素,复制图片

关键是使用image、image/png、image/color包

// main.go
package main

import (
        "fmt"

        "bufio"
        "image"

        "image/png"

        "image/color"
        "io/ioutil"
        "log"
        "os"
)

var picWidth, picHeight int
var rgbaDataList [][]color.Color

func main() {
        readPncPic()
}

func readPncPic() {

        //读取本地文件
        f, err := os.Open("/Users/jiading/Documents/whiteblack.png")
        if err != nil {
                log.Fatal(err)
        }
        defer f.Close()
        g, _, err := image.Decode(bufio.NewReader(f))
        if err != nil {
                log.Fatal(err)
                return
        }

        rect := g.Bounds()
        size := rect.Size()

        picWidth = size.X
        picHeight = size.Y

        fmt.Printf("图片宽度: %d __ 图片高度: %d\n", picWidth, picHeight)

        rgbaDataList = [][]color.Color{}

        for y := 0; y < picHeight; y++ {

                rgbaDataSingleList := []color.Color{}
                for x := 0; x < picWidth; x++ {
                        pixelItem := g.At(x, y)
                        r0, _, _, _ := pixelItem.RGBA()
                        if r0 == 0x0000 {
                                //white 0
                        } else if r0 == 0xffff {

                                //black 1
                        }
                        rgbaDataSingleList = append(rgbaDataSingleList, pixelItem)
                }
                rgbaDataList = append(rgbaDataList, rgbaDataSingleList)
        }

        //      writeLocalFile(pixelData, txtName)

        writePngFile()
}

func writePngFile() {

        //创建新图片
        f, err := os.Create("/Users/jiading/Documents/copypic.png")
        if err != nil {
                fmt.Println(err)
                os.Exit(1)
        }

        m := image.NewNRGBA(image.Rectangle{Min: image.Point{0, 0}, Max: image.Point{picWidth, picHeight}})
        for y := 0; y < picHeight; y++ {
                list1 := rgbaDataList[y]

                for x := 0; x < picWidth; x++ {
                        r0, g0, b0, a0 := list1[x].RGBA()
                        m.SetNRGBA(x, y, color.NRGBA{uint8(r0), uint8(g0), uint8(b0), uint8(a0)})

                }
        }
        if err = png.Encode(f, m); err != nil {
                fmt.Println(err)
                os.Exit(1)
        }

}

func writeLocalFile(val string, filePath string) bool {

        var content = []byte(val)
        err := ioutil.WriteFile(filePath, content, 0644)
        if err != nil {
                fmt.Printf("%s\n", err)
                panic(err)
                return false
        }

        fmt.Println("==写文件成功: " + filePath + "==")
        return true

}

====================================================================================================================

2017_7_16,在win10上测试读取png图片信息时返回错误unkown format类似语句，是因为用到了image.Decode(),改成png.Decode()即可在win10上跑起来。