You can try to press + until satisfied for certain pdf, then look at the .lua file generated belong that pdf. There should be a gamma value in that file, then you can use it as default value in global config file.
This is pure speculation, I didn't try it because I don't want to. But it is simple enough to try.
Update: Upon further reading, maybe there is no global config for this yet (although there is gamma settings in some lua file).
But you really should have a better attitude when you are asking a favor.
Quote:
Originally Posted by aliabbasjp
Sorry for the terse reply . But you should understand that i dont bother about the technical details of how gamma works. I only wanted a solution to darken my text by default.

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