Use compressed texture formats when possible, otherwise prefer 16bit textures over 32bit.

如果可以，尽量使用压缩纹理格式；否则，16位格式纹理性能好于32位的。

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A comparison of uncompressed vs compressed texture performance can be found in the iOS Hardware Guide.

未压缩与压缩纹理性能的比较，可以在iOS硬件指南找到。

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By taking the image to be compressed as a grey-level surface of some fractal brown motion, the fractal dimension of this surface gives out a good description of its texture characteristics.

把灰度图像看作是某种分数布朗运动形成的(分形)灰度表面，并用这种灰度表面的分形维数来刻画它的纹理粗糙程度。

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