Your messages are very hard to read. Please try to put more spaces and white space separating thoughts.
Color space - there are a variety of ways to interpret each numerical value, and they end up being different in result. It sounds to me as if your camera is producing Adobe RGB 1998 files, but most web software renders in sRGB, which is a narrower space. If you edit in Adobe 1998 and display in sRGB, images will appear different even on the same screen.
You need to look into hardware calibration - I forget their names, but look over in the printing scanning and color management forum. I bought mine several years ago and just use it. The calibration will let you set your monitor and system so that it matches the rest of the calibrated world, including brightness.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!