How to set the background color to transparent. I want use style which describe in *.sld file for all my photo with tif format. How to do that?

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    rather than posting new questions please say why this answer doesn't work for you. You need to edit this question with the SLD you are using – Ian Turton Apr 27 '16 at 12:49

Here an example to create one transparent classe. You will use opacity="0.0" parameter:

              <sld:ColorMapEntry color="#000000" opacity="0.0" quantity="-999"/>
              <sld:ColorMapEntry color="#111111" opacity="1.0"quantity="1.0"/>
              <sld:ColorMapEntry color="#AAAAAA" opacity="1.0"quantity="100.0"/>
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