You can choose whether or not to simulate the paper white. With the box unchecked, it doesn't try to simulate the white of the paper but instead uses the white point of your monitor. If you check the paper box, it'll simulate the white of the paper (on your monitor). Depending on the paper, checking that box can make the soft proof look a bit dull because your monitor may be able to produce a better white than the paper.
Regards,
Mike
Regards,
Mike
Thank you, that makes sense!