> Well it might work with a dusty neg but with a digital camera image it only > reduces the amount of detail a bit.... > Chris. Didn't know you were an astronomer. The vast bulk of astro photography now is digital ... routines like this are useful precisely to clear up *noise* in the digital images ... making good pictures better. But then again, the authors say ... "The advanced implementation of the SGBNR technique makes this program a powerful tool to reduce noise in digital astrophotographic images, including film grain in scanned conventional astrophotos as well as background noise in CCD images. " Have they got it wrong? I suspect the routine will fail to remove dust specs - they will just end up being better resolved ;o) Bob
