Discussion
Which of the following redundancy is not eliminated in the lossless compression :
Answer: A
Lossless compression does not eliminate psychovisual redundancy.
Removing psychovisual redundancy means discarding information the eye is insensitive to, typically by quantisation. That information cannot be recovered, so it is used only in lossy compression such as JPEG.
Coding redundancy (removed by variable-length codes such as Huffman coding) and interpixel redundancy (removed by run-length, predictive or LZW coding) can both be removed without losing any information, so lossless methods do eliminate them. 'Both B and C' is therefore wrong.
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