mbitmap = BitmapFactory.decodeStream(getClass().getResourceAsStream("/res/drawable/testyuv2.bmp")); int width = mbitmap.getWidth(); //获取位图的宽 int height = mbitmap.getHeight(); //获取位图的高 datas = new int[width * height]; //通过位图的大小创建像素点数组 mbitmap.getPixels(datas, 0, width, 0, 0, width, height); int alpha = 0xFF << 24; for (int i = 0; i < height; i++) { for (int j = 0; j < width; j++) { int grey = datas[width * i + j]; int red = ((grey & 0x00FF0000) >> 16); int green = ((grey & 0x0000FF00) >> 8); int blue = (grey & 0x000000FF); grey = (int) ((float) red * 0.3 + (float) green * 0.59 + (float) blue * 0.11); grey = alpha | (grey << 16) | (grey << 8) | grey; datas[width * i + j] = grey; } }
android bitmap 转 灰度 byte[] 数组
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