opencv 色彩空间的转换，包括将rgb转成XYZ格式，YCrCb格式，HSV格式及Lab格式-opencv color space conversion, including rgb convert XYZ format, YCrCb format, HSV and Lab format format

本程利用opencv实现了RGB到Lab的颜色空间转换，感觉效果不错。-This process is realized by using OpenCV RGB to the Lab color space conversion, feeling good results.

以OPENCV做的各種色彩轉換空間，有 RGB to gray, RGB to HSV, RGB to Lab, RGB to Luv, RGB to Ycbcr -To do a variety of color conversion OPENCV Space, RGB to gray, RGB to HSV, RGB to Lab, RGB to Luv, RGB to Ycbcr