[Gimp-user] how can I change the existing values of color and alpha ?

I have a plain rectangle with overall c09300c0 RGBA levels.
I want to change the alpha channel value from c0 (193) to some other
value, for the whole image at once. Or some other color channel.

How can I change the absolute value of a channel ? The color menu has
only relative adjustments.

Thank you,

Cristian Secară

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