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08-22-2010, 08:49 AM   #16
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yeah it was during a heat streak in destin. 90+ and high humidity even most evenings... I was definitely giving the camera a workout as well; this one was prolly captured after ~50 5-10s exposures

i imagine that the heat issues are part of a compromise for which the payoff is better/faster electronics and more 'options' for such a small and lightweight body...

is it really worth it to pixel map? is it superior to removing them with photoshop/gimp/whatever? (i had no problem doing so with gimp for the final version of this image)

08-22-2010, 08:56 AM   #17
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QuoteOriginally posted by KungPOW Quote
"pushing" a digital image is one of the best ways that I know of to increase the image noise & banding.

You could make the image look even worse by pushing another stop or two.

So the leason here is that under-exposing, and then pushing is bad.

Interestinly, over-exposing and pulling, is good.

Read up on "expose to the right". Do a google search.
i am familiar with this concept. i believe the underlying reason is that sensors in use in dslrs respond linearly to light whereas film/eyes exhibit logarithmic response...
08-22-2010, 09:01 AM   #18
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Also keep in mind that the camera is sealed. So, it's going to heat up and hold the heat in.
08-22-2010, 09:03 AM   #19
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QuoteOriginally posted by JohnBee Quote
Considering were looking at a 10/1 plus +2 eV push, I think this is quite normal under the circumstances.
Having said that, the image cleans-up quite with a little NR and debanding, so it's all good from what I can see.
are there any good open source *nix friendly NR filters out there? i have feen fond of rawtherapee lately but its own nr filter isn't so great. havent really poked around for one in gimp because i try to do as much processing as possible outside it since it won't handle 16bit images.

08-22-2010, 09:45 AM   #20
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QuoteOriginally posted by mboehm Quote
are there any good open source *nix friendly NR filters out there? i have feen fond of rawtherapee lately but its own nr filter isn't so great. havent really poked around for one in gimp because i try to do as much processing as possible outside it since it won't handle 16bit images.
Hi, unfortunately, the only NR software I know of that runs with Linux was Noise Ninja.
However... the latest advancements in NR really seem limited to the Windows environment. My personal flavor being ACR6.x(Demosaic and Chroma), Niksoft Define(Debanding), and Denoise v5(Luminance Noise, Complex Debanding).

Image editing and processing was one of the main reasons I abandoned Linux and Gimp some years ago.
08-22-2010, 10:06 AM   #21
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@mboehm: There is a new kid on the block in development in the Linux world called Darktable. It is young but is surprisingly capable even now. Give it a whirl if you like:

darktable | news

Jack
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