Fireflies / noise on glossy material I have a bunch of glossy balloons lit by a sun lamp and the world (Background Sky Texture). This is the nodes setup.



After rendering I have the image below. 



When we look at a more detailed level we see a lot of noise / fireflies. 



I already enlarged the size of my sun lamp, set the samples at 1000 and the Filter Glossy at 10. Still noisy image. Also unchecking caustics did not solve the problem. 

Changing the clamp settings does not look like a solution, given the nature of the image. AS I understand it I can only try with extremely large settings for samples. Or is there any other solution to get rid of the noise and keeping the highlights in the image ? Or should I look for solutions outside of Cycles ?  

Here is my file
A few things to try when dealing with fireflies:

Enable Multiple Importance in your light:



Left is your original settings, right with Multiple importance enabled.
(click on the images to enlarge)



Using clamp indirect takes care of most of the fireflies with no noticeable side effects as far as I can see...





Now for a super clean render you might want to use Branched Path Tracing: