I've made a nice picture with my smartphone, but I would like to have a more focused picture (sharp focus and blurred background). How can I do this in Photoshop to obtain the best result?
Things I consider:
I did already cut the object I want focused and made a new layer of it (layer via copy), then blurred the background image (i.e. the original image behind the cut). But then the object will also be blurred in the background, resulting in a kind of glow around my new layer. How can I avoid this effect? Should I edit the background and "remove" the object, or is there an easier way?
the blurriness is actually a function of the distance to the lense, when it's obtained physically. Can I imitate this effect in an easy way? Or should I cut a layer for every distance to the camera then?
is there a measure for how much blur I should add as a function of distance?
is it best to use simple gaussian blur?
Thanks in advance!