Tune Your Display./画面の明るさについて
To displaying pictures in this site, I propose you to adujst your display as follows. 1. set maximum contrast. 2. set brightness as you can distinct the darkest part and the second darkest part in the gray scale above.
一番暗い部分と、二番目に暗い部分の違いが、わずかにわかるくらいのまで下げてください。