saving my render to jpeg problem

bakit ganun, pag nag render ako sa mental ray maliwanag naman, pag nag save na ko to jpg or any image format dumidilim bigla?
sa vray ko naman render ok naman kahit gawin save ko image maliwanag pa din.

meron ba mali sa setting ng mental ray ko?

sir check mo yung gamma settings mo under customize click preferences click the gamma LUT then check mo Enable gamma/LUT correction then check gamma change to 2.2 after that check mo yung after color correction and check affect material editor and go to bitmap files change the input/output gamma to 2.2 pero kung hindi pa rin nagbago sir baka sa settings ng mentalray mo na iyan