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Deep sky stacker image preview questions


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Hi all,

Still trying to get a handle on processing DSO's with deep sky stacker but I've noticed some differences from the images as viewed in the canon software and the previews in deep sky stacker

Some examples:

attempt at flat frames, first image as shown in canon software, second from DSS:

post-11689-0-40462000-1408560687.jpgpost-11689-0-53694600-1408560686.jpg

A single light frame, first image as shown in canon software, second from DSS:

post-11689-0-05281100-1408560690.jpgpost-11689-0-16543500-1408560688.jpg

also the same with darks, I see some red pixels on the canon software, but deep sky stacker the image seems all black.

looks like the DSS images are a lot darker?

I'm likely missing a settings or tick box somewhere, can anyone point me in the right direction?

Or perhaps this is just normal and has no impact on the resulting stacked image?

I'm using:

Canon 1100D with canon software

RAW images

DSS v3.3.4

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I don't know the answer but I posed a similar question today as I found exactly the same thing, in fact the image preview in DSS was way nicer than any I managed to fiddle around with the levels on subsequently. I'm told DSS is famous for doing this, but I don't know why but I sure wish I could replicate that preview version somewhere! I if you find out let me know and I'll do the same.

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In the top right hand corner of the sub-exposure window there is a gamma slider.

Just move that along to brighten or darken the image

post-9007-0-71133500-1408626734_thumb.jp

As long as your subs are in RAW format, then you are not changing anything. Exposure (within limits- you can't change an over or under exposed image), gamma, white-light balance are all set in software. The slider has no effect on the data or on the final image.

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Thanks for the responses all.

One final question:

Does this mean that the flat I have taken isn't correct or would DSS still be able to use it?

As long as the flats are exposed correctly (about 1/3 of the way along the histogram), then they'll be fine.

I assume that you have taken more than one flat? You need about 30 to average out the noise contained in the flat.

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I have taken around 30 flats and 30 flat dark's.

I'll give it a go and see how I get on, I still have the scope/camera setup as it was when I took the lights so can always have another go.

Many thanks for your assistance.

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