PostProcessing effects with Unity (free version)

Hi there,
I’m pretty new to Unity. Only been playing around with it since it was released for free. Though I’m not totally new to game programming (did some XNA stuff lately).

I know from the Unity Website that Unity (free version) does not support PostProcessing effects. However, my question is, are those only the already build-in ones and I can still roll my own. Or is it simply not possible/enabled to “Render-to-texture”, which Postprocessing basically is?

You’re right - the image postprocessing effects are done with RenderTextures, and this is a feature only available in Unity Pro.