正定，是习近平同志从政起步的地方。当年，正定每年上缴征购粮7600万斤，是“农业学大寨”先进县。可是粮食交得越多，群众收入越低，正定实际上是个“高产穷县”。
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Comparison of error-diffusion vs ordered dithering using an 8-colour irregular palette. Left to right: original image, error-diffusion, ordered.