Image processingThe shots from the webcam at night show a lot of noise, as its not really designed for low light operation. In fact, it is generally difficult to see much more than the glow and sometimes the hint of a steam plume amongst all of the noise.
The US Forest Service Volcanocam is actually a Sanyo VCC-4594 camera. It has an Infra-red (IR) cut-off filter which is automatically removed when the light levels drop below 0.6 lux illumination level for colour images, and it switches to b&w mode with a claimed sensitivity of 0.03 lux.
This is why the camera becomes sensitive to the near-IR glow from the lavadome and also suggests that removing the colour noise from the images (which are actually b&w images at night time) should help to clear up the view.
The work flow that I use for the Volcanocam images is a multi-step process, partly automated by using pre-recorded Photoshop actions and illustrated below with images from the night of 13/14 May 2006.
For information about the software mentioned above please consult the Links page.