Benday process: a method of mechanically transferring dots or texture patterns to produce tonal value in line drawings.
本戴制版法：用机械方法把网点或纹理图案转移到线条画上以产生明暗色调的效果。
The invention discloses an image compression method used for compressing RGB images, which comprises the following steps: Step 1, sampling is carried out to the pixel tonal value of an original image;
本发明公开了一种图像压缩方法，用于对RGB图像进行压缩，包括如 下步骤：步骤1，对原始图像的像素色调值进行取样；
The tonal range of the image is graphed according to its brightness value.
它的排列范围就是图像明亮程度的梯度反映。
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