图片处理--冰冻特效
1、算法
将对rgb 值依次做better处理,同时再下一步用到上一步已经处理好的值。
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 = better(r-g-b); g = better(g-r-b); b = better(b-r-g); pixels[i*width +j] = (pixel & 0xff000000) + (r<<16)+ (g<<8) +b; } } return Bitmap.createBitmap(pixels ,width , height , Config.ARGB_8888); } public int better(int value) { value = value *3 /2; if(value<0) { value = -value; } if(value>255) { value = 255; } return value; }