Article 5P5WA GIMP: how to make the file transparent to 80%; except the red curve which can stay

GIMP: how to make the file transparent to 80%; except the red curve which can stay

by
floppy_stuttgart
from LinuxQuestions.org on (#5P5WA)
Sorry to be here with that topic but the GIMP forum was a nightmare for having an account and asking.
The file in the attachment should be modified 80% transparent, except the red curve. How to do this in GIMP?. Any advice is welcome.
(I am using GIMP under Linux).
I try to see if this gamma function extract will pass through points I have on a JPG picture.
(mathematic visual building things.. and linux.. )
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