renormalize

1. The bad thing is that the DXT compression formulas for color images used in DirectX favors only the green channel (usual 30%, 59%, 11% formular), the blue/z channel isn't that important (especially if we renormalize later), but the image quality can be improved by preserving the red channel better.
    坏的是，在使用DirectX的彩色图像DXT压缩公式主张只有绿色通道（通常30％，59％，11％公式），蓝/？通道并不重要（尤其是如果我们归一化后），但图像质量可以改善红色通道保存较好。

verb