Paul
On Mar 13, 2005, at 8:29 AM, Frantisek wrote:
Sunday, March 13, 2005, 1:55:00 PM, Rob wrote: RS> On 13 Mar 2005 at 9:24, Jens Bladt wrote:
You can correct WB and exposure ( ac
couple of steps to either side) without quality loss in the computer, if
it's RAW. This means you can correct both brigghness and colour without
loosing image quality/information.
RS> Like exposure colour can be corrected in a RAW file but within bounds too,
RS> really low temp exposures often suffer from difficult to deal with blue/green
RS> channel noise.
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.
Sadly, I don't have any stronger CC filters I could mount on a lens at the moment. Only gels for correcting lights. I would try it out somedya.
Good light! fra
