回复：急向各位大侠请教：如何分析图片亮度

It is quite simple to do it in PHOTOSHOP 8.0 CS:
Select the area you want and then:Image ->Adjustments ->Bright/Contrast

If you don't have PHOTOSHOP 8. Try to copy & paste the area to a new layer(on top of the orginal image but in the same position), then adjust the new layer



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