对信号点不加处理，灰度值不变。
图像定量分析法测量pcna阳性产物面积及灰度值。
PCNA positive surface area and grey scale value which were measured by quantitative image analysis.
同时它利用了不同灰度值象素的梯度信息，具有较好的稳定性。
It makes use of grads information of the different gray. It has good stability.
返回一个颜色对象他的灰度值是1.0并且它的透明度是1.0。
Returns a color object whose grayscale value is 1.0 and whose alpha value is 1.0.
与二值图像相比灰度图像具有丰富的信息。
Gray scale image have more information than the binary image.
与二值图像相比灰度图像具有丰富的信息。
Gray scale image have more information than the binary image.
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