Practical And Continuous Tones 实用与连续色调
JPEG: practical and continuous tones, multi-level gray scale, color or monochrome static images.
JPEG：实用与连续色调，多级灰度，彩色或单色静止图象。
Compared with standard error diffusion, the image using this algorithm has more explicit output and more continuous tones.
与传统的误差扩散法相比，使用这种算法输出的半色调图像更清晰，色调更连续。
Posterization: Darkroom techniques which turn the continuous tones of a photograph into three or four flat tones; to produce a picture resembling a poster. Also called tone separation.
海报化：把连续色调的相片用黑房技巧转为三至四个平调，造成像海报的图画的情况。亦称色调分离。
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