
Add Object to Photo
Nothing constrains an addition, which is the difficulty
A replacement inherits a position and a scale from whatever it displaced. An addition inherits nothing. There is no footprint to match, no contact point already established, and no shadow on the ground pointing to where the thing ought to stand. That freedom is precisely what makes it easy to add object to photo badly: an item can be placed anywhere, at any size, and nothing in the picture will contradict it except the accumulated sense of the viewer that something has been introduced.






