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Do frontbuffer have alpha value?

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I was trying to save a .tga image using GetFrontBufferData method,but alpha value is lost.They are totally one.I could get right alpha value from RenderTarget or BackBuffer,but not rgb value is not correct.Even the scene present to show immediately,backbuffer still seems darker than frontbuffer and lost some details.
Now I get 2 questions:
Q1:Do FrontBuffer have alpha value?
Q2:What is the difference between the data of back buffer and front buffer when you try to render transparent things? Edited by Tunisia hawker

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