gdanmitchell Offline Upload & Sell: Off
|
p.2 #4 · p.2 #4 · // Significant color noise during long exposures // | |
redcrown wrote:
I'm confused. Why would you spend an extra 10, 20, or 30 minutes letting the camera do "LENR" when many post processing options can do the same thing in seconds? The disadvantage is obvious, what's the advantage?
The advantage is that they don't do "the same thing in seconds." Typical post-processing tools can let you control typical noise, but they are not designed to deal with the hot pixels (pure red, green, or blue) that can appear in long exposures.
You could try the separate exposure method that someone described earlier in this thread, though it is not as effective. You could also use the multiple exposure technique. In a pinch you can use the clone tool to "spot" them out in some cases.
AmbientMike wrote:
I haven't read all the way down , but as far as the op's question, I get a lot of noise at a minute or two on aps and m4/3. FF might give a longer ss, since ff is generally a lot better on noise.
Cameras with larger sensors, all else being equal, are a bit less susceptible to issues like this one.
Odd colored pixels seem to disappear in my older version of DPP. Just haven't had a problem with them.
Some raw conversion software will automatically map out hot pixels. Many sensors have some, and the software can quickly identify where they are and what problem they pose, and then use that data to remove them from files from the known camera. (In a few cases, the first time you open raw files from a brand new camera in your raw converter you might, if you look closely and quickly, spot some hot — often red — pixels and then actually see the software "turn them off.")
I don't think that the post-processing software will do this with the kinds of pixels that appear with very long exposures.
Dan
Edited on Jun 25, 2015 at 10:49 PM · View previous versions
|