Forward a post from Baidu 720P point to ponit scan compare to 720P renderd under 1080P P1,P2,P3,P4 all are 720P rendered , but P2 and P4 is rendered under 1080P screen, P1 and P3 is under 720P screen.... Because a pixel only can show a color(P5,P6), once a pixel have many colors(P7),the color will be mixed to appear a neutral color(P8), that reason for blur. OP:
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