private static boolean isExpectedSize(String key, BufferedImage image) {
        if (key.endsWith(NORMAL)) {
            //normal
            return image.getWidth() == Constant.Runtime.width[0]
                    && image.getHeight() == Constant.Runtime.height[0];
        } else if (key.endsWith(TAPPED)) {
            //tapped
            return image.getWidth() == Constant.Runtime.height[0]
                    && image.getHeight() == Constant.Runtime.width[0];
        } else {
            //original & full is never wrong
            return true;
        }
    }