ok ,it’s great.thank you very much .i have solve my problem.It’s very kind of you for so patient to answer my question.Best wishes to you.
we are here to help 
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hello ABraun,I have another question what does the rough statistics mean? i want to use the sigma0 to reseach the soil water,should I click the rough statistics button,will the sigma0’s value change?
this just means that the histogram shown in the color manipulation (and the min/max) values are not based on all pixels but only a small proportion. If you wanted to get to know the absolute maximum (or mean or whatever) you need to use the statistics tool (the E icon). But for the distribution of colors over the color range, it is sufficient.
The pixel data is not affected by the Color manipulation tab at all, just the assignment of grey values.
thank you very much.you really help me a lot.:玫瑰:
hello,ABraun.
![image|690x499] now I want to export tif. file of the band of sigma0VV data as this.will it affect the value of pix of sigma0VV?
give it a try
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ok,thank you very much!