当看腻了彩色照片，或者照片的色彩过于杂乱时，将照片处理成黑白的，便有了一番老照片的味道，有了厚重的历史感。当然，并非所有的照片都能得到这样的味道，前期拍摄时的光影恰当(特别是光位的合理运用)，整出来才好看。

    这种后期处理并非简单地扔掉彩色就完，需要适当提高对比度，让过多的灰调向黑白两端靠拢(扩大灰度级)，黑的要黑，白的要白，这才像真正的黑白片。 

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