What is YCbCr ?

wiki : YCbCr

做有關影像處理的時候多是以RGB值表示，但是若想用JPEG壓縮那就要換成以YCbCr表示。
Y'CbCr is not an absolute color space, it is a way of encoding RGB information.

以下一一介紹

YCbCr or Y'CbCr is a family of color spaces used as a part of the Color image pipeline in
video and digital photography systems.

Y' is the luma component

Y'跟原本的G值有關，主要影響亮度。

Cb and Cr are the blue-difference and red-difference chroma components.

這兩個就跟B以及R有關，主要影響彩度。

The prime (') on the Y is to distinguish the luma from luminance, meaning that light intensity is non-linearly encoded using gamma.


相關閱讀；

• 视讯基础知识－颜色空间
• Camera Sensor 图像处理原理及实例分析
• Diff of Y-Cb-Cr & Y-Pb-Pr