如何修改位图的RGB像素以使其看起来不同

Question

有什么办法可以将位图转换为棕褐色？我知道要转换为grayScale是在ColorMatrix中设置setSaturation。但是棕褐色呢？

Answer 1

我知道答案，但也许有些人有其他更好的解决方案。

public Bitmap toSephia(Bitmap bmpOriginal)
{        
    int width, height, r,g, b, c, gry;
    height = bmpOriginal.getHeight();
    width = bmpOriginal.getWidth();
    int depth = 20;

    Bitmap bmpSephia = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bmpSephia);
    Paint paint = new Paint();
    ColorMatrix cm = new ColorMatrix();
    cm.setScale(.3f, .3f, .3f, 1.0f);   
    ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
    paint.setColorFilter(f);
    canvas.drawBitmap(bmpOriginal, 0, 0, paint);
    for(int x=0; x < width; x++) {
        for(int y=0; y < height; y++) {
            c = bmpOriginal.getPixel(x, y);

            r = Color.red(c);
            g = Color.green(c);
            b = Color.blue(c);

            gry = (r + g + b) / 3;
            r = g = b = gry;

            r = r + (depth * 2);
            g = g + depth;

            if(r > 255) {
              r = 255;
            }
            if(g > 255) {
              g = 255;
            }
            bmpSephia.setPixel(x, y, Color.rgb(r, g, b));
        }
    }      
    return bmpSephia;
}