Ok, thank you for your advice.

Of cause my image don't have a varying brightness, because I do my shots at home and use flash on manual mode. But, some fluctuations of brightness exist, because diaphragm can't close on the same value every time, and power of flash can change on very little value. So, some fluctuations of ...

Can you add a possibility change a value adjustment brightness, like it is done on adjustment rotate and scale? Now brightness can be changes too strong, so some area of image are clipping. I would change the brightness about 1% or less.