YCbCr has a native data range of 16-235 (though it technically can do 0-255, but more on that later). The difference? Well, while you would think that RGB and its 0-255 would have a greater amount of ...

YCbCr is an alternative color space to RGB—instead of treating color as red, green, and blue, it handles the information as a mix of luminance (brightness) and chroma (color).

YCbCr Is the Digital Equivalent of YUV. The YUV color space is encoded digitally as YCbCr. The luma uses the same Y designation, but U and V become Cb and Cr (for details, see YUV).