如何使用Golang对图片进行边框和边缘增强

import (
    "image"
    "image/color"
    "image/draw"
)

file, err := os.Open("input.jpg")
if err != nil {
    log.Fatal(err)
}
defer file.Close()

img, _, err := image.Decode(file)
if err != nil {
    log.Fatal(err)
}

borderWidth := 10
borderColor := color.RGBA{255, 0, 0, 255} // 红色边框
borderRect := image.Rect(0, 0, img.Bounds().Dx()+borderWidth*2, img.Bounds().Dy()+borderWidth*2)

borderImg := image.NewRGBA(borderRect)
draw.Draw(borderImg, borderImg.Bounds(), &image.Uniform{borderColor}, image.ZP, draw.Src)
draw.Draw(borderImg, img.Bounds().Add(image.Point{borderWidth, borderWidth}), img, image.ZP, draw.Src)

outputFile, err := os.Create("output_with_border.jpg")
if err != nil {
    log.Fatal(err)
}
defer outputFile.Close()

jpeg.Encode(outputFile, borderImg, &jpeg.Options{Quality: 100})

radius := 1.0 // 边缘增强半径
threshold := 50.0 // 边缘增强阈值

enhancedImg := image.NewRGBA(img.Bounds())
for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
    for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
        r, g, b, _ := img.At(x, y).RGBA()
        neighbors := [9]color.Color{
            img.At(x-1, y+1), img.At(x, y+1), img.At(x+1, y+1),
            img.At(x-1, y), img.At(x, y), img.At(x+1, y),
            img.At(x-1, y-1), img.At(x, y-1), img.At(x+1, y-1),
        }
        var totalDiff float64
        for _, neighbor := range neighbors {
            nr, ng, nb, _ := neighbor.RGBA()
            totalDiff += diff(r, nr) + diff(g, ng) + diff(b, nb)
        }
        if totalDiff/9 > threshold {
            enhancedImg.Set(x, y, color.Black)
        } else {
            enhancedImg.Set(x, y, color.White)
        }
    }
}

outputFile, err = os.Create("output_with_enhanced_edges.jpg")
if err != nil {
    log.Fatal(err)
}
defer outputFile.Close()

jpeg.Encode(outputFile, enhancedImg, &jpeg.Options{Quality: 100})