02-05-2011, 11:11 AM
Noise reduction is always best done first, this is because most (good) noise reduction algorithms try and model what is going on in the camera. If you've done anything to the image first, (which includes JPG conversion), this can confuse them a little.
The reason you can see noise after teeth brightening is that whenever you increase the exposure of an area, that will also boost any noise that is in the area (effectively you're increasing the ISO in a specific area when you brighten it). Ideally, shoot at a much lower ISO, with a tripod and/or more light. If all else fails, and you want to do brightening teeth do more noise reduction than you otherwise would to compensate for boosting the noise in the teeth. Or a very light touchup brush in the teeth can also smooth out a bit of noise too.
Resolution is a different thing from noise, and is kind of independent. You might as well work with the images at the resolution they come out of your camera, rather than making them smaller first.
Let me know if you have any more questions,
Tony
The reason you can see noise after teeth brightening is that whenever you increase the exposure of an area, that will also boost any noise that is in the area (effectively you're increasing the ISO in a specific area when you brighten it). Ideally, shoot at a much lower ISO, with a tripod and/or more light. If all else fails, and you want to do brightening teeth do more noise reduction than you otherwise would to compensate for boosting the noise in the teeth. Or a very light touchup brush in the teeth can also smooth out a bit of noise too.
Resolution is a different thing from noise, and is kind of independent. You might as well work with the images at the resolution they come out of your camera, rather than making them smaller first.
Let me know if you have any more questions,
Tony