when trying to upload images of different sizes, a black layer was formed in picture colors other than the original size. this problem ;

public $gamma_correct = false;

I figured it out by typing.

Ekran görüntüsü 2021年04月25日 103900
Ekran görüntüsü 2021年04月25日 103951
Ekran görüntüsü 2021年04月25日 104013