暗调图片上的色调差不多全在色调梯尺的黑色部份，白色只占很少面积。
A low key picture is almost entirely at the dark end of the tonal scale, and there are only small areas of light tone.
根据阴影与非阴影区域间存在色调差异，利用HSV彩色模型，提取可能阴影区域。
According to hue difference between shaded and non-shaded regions, possible shaded regions were extracted by HSV color model at first.
当诱导域与试验域之间的色调差增大时，试验目标色觉位移的幅值减小，而色觉位移矢量偏离恒定色调线的偏向角却增大。
When the hue difference increased, the magnitude of color shift in test target decreased, but the deflection Angle of color shift vector from constant hue line increased.
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