Can photos be scanned or imported into Blender 2.7 and manipulated.
well, you can “import” photos into Blender ( quite basic operation), but how do you want to “manipulate” them?
If you’re looking for an image editor like Photoshop that is open source like Blender, I recommend GIMP. Blender is a 3D suite, not a Photoshop replacement.
I’ll echo what K Horseman said. You’re probably looking for something more like GIMP or Krita:
It helps if you state your questions and goals clearly.
The compositor is done for that purpose ! http://wiki.blender.org/index.php/Doc:2.6/Manual/Composite_Nodes
You can manipulate the image, grade the colors, add some effects or 3d integration, anything you want is almost possible.
But you can’t scan the picture directly in Blender.