Quick question - editing on Photoshop

Buy a book called Light Science and Magic and learn how to properly light. Also, strobist.blogspot.com is an excellent resource for learning lighting. This image pretty much is what it is, not going to do much with it.

Hi

These white spots are specular lights. It means than for CMYK print there is nothing but the paper at these locations. In RGB mode  there is full 255 light levels.

You could try to set up the white sampler to grey but all your image would be affected… even correcting the gamma (middle point) would not adress the issue.

Or better you can select Image > Adjustments > Replace Color

Select white and set it to grey… That would not affect other colors