Images used in this example are 6,000 x 3,000 pixels, so reading from the getwidth and getheight subroutines is done before the for loops for a significant speed increase.
本例中使用的图像是 6,000x 3,000像素，因此读取getwidth和getheight 子例程是在for 循环之前完成的，这样可以显著提高速度。
Images used in this example are 6,000 x 3,000 pixels, so reading from the getwidth and getheight subroutines is done before the for loops for a significant speed increase.
本例中使用的图像是 6,000x 3,000像素，因此读取getwidth和getheight 子例程是在for 循环之前完成的，这样可以显著提高速度。
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