Compare YCbCr and RGB. Why chroma subsampling for compression?
Tests color decorrelation and perceptual redundancy. Contrast correlated RGB with YCbCr's luma-chroma split; eyes resolve brightness better than color, so 4:2:0/4:2:2 cuts chroma bandwidth ~50-75% with little loss.
WHAT IT TESTS: Understanding of color space decorrelation and perceptual redundancy. ANSWER OUTLINE: First, contrast RGB's correlated channels with YCbCr's separation of luma (Y) from chroma (Cb, Cr). Second, explain that human eyes have much lower spatial acuity for color than brightness due to rod-cone distribution, so we perceive luminance detail far better. Third, link this to 4:2:2 or 4:2:0 subsampling, which cuts chroma resolution by 50-75% to save bits with minimal visible loss.
Read the original → Wikipedia: YCbCr
- #color spaces
- #video compression
- #chroma subsampling
- #perceptual coding
- #ycbcr
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