Can I change the transparency of a selection keeping the relative transparency each part already has proportional?

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I want to give the middle full opacity but let the border effect that is already existing.

Answer

One option might be to convert a color in your image to transparency:

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Go to Layer -> Transparency -> Color to Alpha

This way you can choose exactly what you want to be transparent by making it a certain color and then converting that color to transparency.

Attribution
Source : Link , Question Author : Poutrathor , Answer Author : Sam R

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