grainy rendering

[ccb]

I'm just getting started with TG2 after using the old TG.  I've done a few test pages and all of them come out looking grainy.  I know it must be some setting that is off.  Here is the picture - http://www.cbrundage.net/testpage.jpg - (I know the terrain needs a lot of detail as it looks flat but it is that grainyness, esp. in the sky, that I can't understand.)  Many thanks for any comments.
Christina

[sjefen]

Yeah. You should rise the atmosphere samples.
It will also rise the render time

- Terje

[ccb]

Thanks - I'll make that change.

[domdib]

Check out the sticky on render settings - v useful advice.

[Aagam]

A general rule to remember: if your picture will have lots of shadows/low light, rising atmospheric samples is usually a must.