partitioning - Windows dual boot installation - will Ubuntu take all the space?

I have Windows 7 installed, and it's taking up 51GB of space. I don't know whether or not it is in a partition in my C drive, but I have 450GB free space.

When I install Ubuntu does it use ALL of the free space as a partition for Ubuntu, or does it just use whatever amount it needs? I'm hoping the installer will know how much space to allocate to Ubuntu and not take all the free space.