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I have a PNG with a completely transparent background as well as semi transparent pixels around the main image (think shadows / blur).

On its own, it displays as I expect. If I use it on a web-page, the page background colour shows through the transparent and semitransparent pixels with the various levels of opacity. Good.

However, when I paste this alpha image into a separate PNG image ( which has no alpha ) in a new window in GIMP, the semi transparent pixels loose their alpha settings and become completely opaque.

How do I fix this?

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    Transparency never copies and pastes correctly in any software. Use whatever Place / Import your build of GIMP has instead – Ryan Jul 31 '15 at 16:45
  • This is effectively a tech support question and will most likely be closed as such - but when you ask this somewhere else, please try to be more specific. Someone should be able to redo exactly what you did, on their own system. – Michael Schumacher Aug 5 '15 at 14:51
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when I paste this alpha image into a separate PNG image ( which has no alpha ) in a new window in GIMP, the semi transparent pixels become completely opaque.

I did reproduce your issue, but it only occured if pasting into an indexed mode new window, so you can fix this by pasting your image into a RVB mode new window instead.

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