I noticed that after I take a picture and I goes to the gallery and you reopen it the picture seems not as bright as when you took it. I don't know why its doing that.
sorry we all missed this question.
if I'm not mistaken, the reason your photo seems a little dark after you took the picture and are trying to view it from your gallery is that you have the screen brightness turned down. try turning up the brightness to see if this helps.