Screenshot with posteffects but without GUI

My project has a main-camera, a minimap-camera and a 3d-GUI-Camera.

The main-camera has blur and tilt-shift effects on it.

I want to save only the main-camera with its effects into a screenshot.

What I get using “function OnPostRender()” is my main-camera only - but without post effects.

(I need a solution that avoids to separately deactivate the other cameras.)

If all else fails, you might try a Render Texture, or some of the screenshot scripts over on the Unify Community Wiki.