图片处理--连环画特效

1、算法

R = |g – b + g + r| * r / 256

G = |b – g + b + r| * r / 256;

B = |b – g + b + r| * g / 256;

然后灰化。

2、代码实现

 public Bitmap render(Bitmap bitmap)
  {
    if(bitmap == null)return null;

    int width = bitmap.getWidth();
    int height = bitmap.getHeight();

    int[] pixels = new int[width * height];
    bitmap.getPixels(pixels ,0 , width , 0 , 0 , width , height);
    for(int i=0 ; i<height ; i++)
    {
      for(int j=0 ; j<width ; j++)
      {
        int pixel = pixels[i*width +j];
        int r = (pixel & 0x00ff0000)>>16;
        int g = (pixel & 0x0000ff00)>>8;
        int b = (pixel & 0x000000ff);

        r = algorithm(g , b , r , r);
        g = algorithm(b , g , r , r);
        b = algorithm(b , g , r , g);

        int gray = (r*3+g*6+b)/10;
        pixels[i*width +j] = (pixel & 0xff000000) + (gray<<16)+ (gray<<8) +gray;
      }
    }

    return Bitmap.createBitmap(pixels ,width , height , Config.ARGB_8888);
  }

public int algorithm(int doubleValue , int negative , int positive , int multi)
{
  int  value = 2*doubleValue - negative +positive;

  if(value<0)
  {
    value = -value;
  }
  value = value * multi /256;
  if(value>255)
  {
    value = 255;
  }
  return value;
}