Thursday, October 16, 2008

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.


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