65 seconds exposure + 65 seconds exposure with closed shutter = noise reduction.you can actually move the cam and stuff it into your pocket as soon as "data is being processed" is displayed.
I can't I have a small bag
. You're right with what the exposure duration consists of.
Here are my examples, I didn't plan anything, so I forgot to also try it with in-camera NR
for comaring the results.
I didn't apply any further post processing, however I summed the jpegs and substracted the Darkframes with gimp just
to save sd-card lifetime.(Please don't start a discussion about what the best image manipulation program is.)
Here are some image parts:
First the Result of 3 summed RAWs with 3 times substracted a darkframe, take AFTER the actual shots.
Here is how it would look like with 3xsubstraction of a darkframe taken BEFORE the actual shots.
As expected the one above isn't that much better that this one here without any NR.
I thought 3 Images would be enough, as we really had very bright moonlight yesterday. But, as you can see, I should have taken more.
I think it's already much better thinking about time compared to in-camera NR, but if we could take the darkframe automatically with a script, without having to put a "lens-cap" on would be even better.
Any ideas on how that is done by the camera, and how to do it with CHDK?
I can offer some help of an unexperienced student trying out all available languages
.
