Hello guys, so recently I have to do a project to school, but I'm kinda stuck and I just can't find an answer online. And I thought it would be so easy to find answer for that question. Anyway, I have to make a code, what changes brightness of your picture by 40% and then by 90%, but it should be the same code with different numbers. But even when I've tried to google something like "making image brighter" or "changing brightness", nothing what I wanted popped up...
Thanks for help
E: I tried ImageAdjust[img, {0, 1.4}] but nothing has changed. I assume it's badly written code.
