这种图像可以增强一幅图像中较暗部分的细节，从而可以用来扩展被压缩的高值图像中较暗像素，因此对数变换被广泛的应用于频谱图像的显示中。-Such an image can be enhanced detail in dark portions of an image, a high value can be used to expand the compressed image of the dark pixels, the logarithm is applied to display a wide spectrum of image conversion.