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png background and windows clipboard

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maybe a noob question.

I have a png image that the user can copy programmatically to the clipboard in Windows (this is a wpf client application). When the user pastes this image somewhere else, the background is black.

I had converted this image from ico to png using paint.net. I understand this happens because the background layer is transparent. One way would be to set the background layer to white.

I can't work out how to do this.

Some png images don't have this problem and I examined them but I can't see the differences

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For some reason or another, the Windows clipboard only supports the alpha channel with the BMP file format. The easiest way to deal with it is paste your image into a temporary folder and then Layers -> Import from File.

ah thanks it worked!

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