On 13 Mar 2005 at 14:29, Frantisek wrote: > That brings again the question about whether it would be better to use > CC filters on digital camera instead of boosting the blue channel in > postprocessing (whether RAW, or camera's jpeg ASIC processor). > Especially at high ISO where the amount of blue channel boost brings > significant blue noise under low temp tungsten light. > > Granted, you would loose 1-2 stops of sensitivity overall (depending > on the filter strength you would use), but you are "loosing" > sensitivity in the blue channel when letting the camera boost it (I > don't know how to express it better in English). > > Of course that doesn't apply where you need every bit of ISO to > capture moving subjects, but for more static subjects, this could give > better results noise-wise. > > Even with "intelligent" noise processing like Noise Ninja or Neat > Image (noise profiles), there is some inevitable loss of colour > resolution, especially if you need to correct a large amount of colour > noise. I have seen this when I shot some club interiors.
I've done it, there is an improvement over using no filter when shooting under very low temp light sources but of course the compromise then becomes speed. A lot of the time if colour noise gets too out of control I resort to de- saturation but if shooting static objects that need good colour accuracy like jewellery it works well. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
