Quote - I have a question ...

This is an enlargement of my previous post, showing the red flecks in the hair (which I retouched out).

What causes this and is there a way to avoid them ?

 

Thanks for your assistance!

 

Michael

Not sure about rendering.. but if it was a digital photograph, that's called hot noise.  What it's usually caused by then is using too fast of an ISO setting in low light situations.  I would assume that it would be the same thing since luxrender uses real-world lighting as its model.