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It's a hybrid of lossless and lossy compression - text, lines, and single color blocks use lossless compression, and photos and other complex images use lossy compression.
Note that this behavior is in complete agreement with fundamental physical laws because the material is both dispersive and lossy ; thus, the energy velocity is not superluminal.
Something like JPEG or MP3 compression IS lossy .
Again, the agreement between the full wave and quasi-static calculations is due to the use of equations 4 and 5 to find the surface impedance of the lossy semiconductor layer.
Distortion is a numerical measure of the difference between the original image and its reproduction, after lossy compression.
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