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Sorry if I write in an old topic: I tried to put logos but I don't know how to create ''alpha_logos''. Can someone tell me how to do that? Thank you very much

Sorry for my English. I use google translate.

When you have the logo adapted to the black background, you must double click on the minute of the logo where the layers are.
The "layer style" window will open.
Look for "color overlay", select the white color and accept.

You will already have the color overlay effect on the logo layer.
Now you should save the image in indexed color and in bmp format.