Cycles Problem

Cycles is still very new to me, so this may be a silly question. Today I was trying to render a simple picture, and the actual render was very different from the 3d viewport preview. There was a great increase in the contrast in the render. Does anyone know what the problem is?

go back to the Blender Internal engine, check the color management checkbox in the render settings panel. return to Cycles, that should have fixed it.

That fixed the problem…Thanks a lot!