I’m making an outline model of two sides of the house, in order to look at different paint combinations. The photo is a corner shot, with good perspective lines. Having built the model, I relize that I should have first modified it in Gimp, to set the house itself to a greyscale with the yard as coloured surrounds.
Is is possible to directly replace the existing photo? If so, how? If not, how would you suggest I try to achieve this objective? I have Sketchup 2017 on a Mac with Sierra.