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Old 06-06-2013, 11:36 AM
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Quark (Trevor)
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Join Date: Apr 2008
Location: Broken Hill NSW Australia
Posts: 4,110
Congrats Stuart, excellent result.

Let me start by saying I am a big fan of WinJUPOS derot. That said processing is an individual thing and there are many different paths that can arrive at a similar destination.

Blinking these two images, the level of noise in the single avi makes identification of discrete detail difficult. What is noise and what is real.

Looking at the derot image, clearly there is better signal to noise and the thing that caught my eye was the bright spot in the NEB that it resolves. This spot is pretty well in the middle of the NEB and a little toward the P limb.

I find that movement helps to identify detail. When you click on the image from your IIS thread it opens in a smaller window. If you drag that window, slowly to and fro across your screen the discrete detail is more easily identified.

In both your single avi and 20 min derot version this bright spot can be seen within the NEB. At first glance it is difficult to see but if you drag it to & fro across the screen it becomes quite apparent.

I have heard elsewhere this crock that detail is lost with WinJUPOS derot. Here you have an example of a very diffuse spot in the NEB that is visible in a single avi and also in a 20 min derot version. The thing I would point out regarding that fact, is you have retained a very diffuse feature in a much smoother image. Not smoother due to any smearing but smoother due to a greatly improved signal to noise ratio. Noise is not detail.

Regards
Trevor
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