After a welcome to the (hopefully) lots of new viewers from the Miro Guide, I continue to shrink a real building site to a model train scale.
The Focus Blur plugin needs a “Depth Map”, a grayscale image which defines the amount of blur in each part of the image. Rob A has made a tutorial about making a believable depth map. It’s not enough to make a simple gradient, you have to keep things with the same distance to the focal plane on the same level of gray and make the gradients follow the planes in the image. And here my subect turned out to be too complicated. My result is not as good as I wanted.
If I wanted to do this again I would choose a different subject and camera position. Higher up and farther away and so including more stuff. And I would look out for regular shapes in the area to make building a depth map easier.