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how to convert alpha pixels to their full opacity

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I have several pictures that when I shrunk them they develop a "ring" of sami-transparency.

I was wondering how I can convert those to their full opacity.

I found using curves+ helped but also converted my full alpha to black and thus caused another step to remove that. Fortunately my image was eassy, I can see how som images wouldn;t be easy in the future.

to clarify...

alpha = transparency/opacity?

full alpha (can not be seen) is value 0? fully opaque value = 255?

so for my application if alpha value <255 and >0 then alpha value = 255

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