I am trying to learn some basics of photoshop. I am trying to touch up a few of my architecture projects.

The pictures I have of them show up as a black on a grayish paper, and another student used blending options to make it a brighter white background.

Well I am trying to do that again, on some of my other projects, but I cant get anything to work.

Could someone tell me how to do it.

Heres the picture, Id like to do it on my own though so I know how to do it, because I have many different pics of other projects.

 

Well I am not quite sure what you exactly mean, but I would suggest using the magic wand tool to select the area, and then go to Image>Adjustments>Exposure and increase the slider.