Line 20 accesses the top of the stack (the top of the stack has an index of -1) as a Lua string, prints the message, and then removes the value from the stack.

第20行访问栈顶(栈顶的索引为- 1)作为lua字符串，打印消息，然后从堆栈中删除该值。

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The results give the measuring accuracy and coincidence between the print grain index values and the perceptible graininess on the prints, proving the efficiency of the method.

实际测试和观测比较表明，所测彩色负片印片颗粒指数数值与其扩印效果相符合，印片颗粒指数方法能够反应彩色负片颗粒性的实用效果。

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