ImageUtils.java 文件源码

/**
 * 转为灰度图片
 *
 * @param src 源图片
 * @param recycle 是否回收
 * @return 灰度图
 */
public static Bitmap toGray(Bitmap src, boolean recycle) {
    if (isEmptyBitmap(src)) {
        return null;
    }
    Bitmap grayBitmap = Bitmap.createBitmap(src.getWidth(), src
            .getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(grayBitmap);
    Paint paint = new Paint();
    ColorMatrix colorMatrix = new ColorMatrix();
    colorMatrix.setSaturation(0);
    ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(colorMatrix);
    paint.setColorFilter(colorMatrixColorFilter);
    canvas.drawBitmap(src, 0, 0, paint);
    if (recycle && !src.isRecycled()) {
        src.recycle();
    }
    return grayBitmap;
}