Increase opacity for PNG in GIMP

I have an image already at 100% opacity but the whole image is partially transparent (with a transparent background).

Is there some way to uniformly increase the opacity (effectively going beyond the current 100%) ?

Answer

Easily done by “stretching” the alpha channel so that the maximum value becomes 100%. The “Levels” tool (Colors>Levels) conveniently shows the histogram:

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Attribution
Source : Link , Question Author : Enigma , Answer Author : xenoid

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