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Jupiter 18th Nov - better seeing after midnight here in London

jimness

By jimness
in Imaging - Planetary

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jimness

jimness

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I havent seen a jupiter image that good in a long time. I found seeing REALLY rubbish lastnight, didn't stay out later than 11pm though.

Thanks! Yeah it was rubbish for a while but turned a significant corner just at midnight. I only really noticed the difference when starting to process these today, as I was recording remotely to help minimise wobble in my wooden shed (except when the cats leap all over it)

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neil phillips

neil phillips

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These were a whopping 3 mins per channel, by the way. Think I sussed where I was going wrong with Winjupos at last (cheers Freddie)

Hi Jim so did you just shoot 3 min sequences and then input the mid time point. There is a way to take out more rotation by shooting 1 min sequences and de roating the RGBS and combining into RGBS before doing the final de rotate rgb frames. Although here it hardly looks like it needs it

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jimness

jimness

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Wow, many thanks for the comments all!

Hi Jim so did you just shoot 3 min sequences and then input the mid time point. There is a way to take out more rotation by shooting 1 min sequences and de roating the RGBS and combining into RGBS before doing the final de rotate rgb frames. Although here it hardly looks like it needs it

I started by de-rotating each AVI using a stacked image of the original AVIs as the reference image. As per Freddie's suggestion I've started using the start of the capture rather than the mid-point as the input time, as that's more or less what the stack was aligned on in AS!2. Then after stacking again in AS!2 and adding wavelets in Reg 5 (really only slider 1), the RGBs were de-rotated again using the start of the capture as the input time.

Another thing I've stopped doing is using the R image as luminance and just sticking with good old RGB - I got a much smoother result that way. Dunno why I ever went down the RRGB route now.

Anyway all this took ages so good job I had a sick day yesterday (!) - oh and not helped by discovering that de-rotating doesn't work when your original captures are upside-down :embarassed:

Jim

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neil phillips

neil phillips

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Wow, many thanks for the comments all!

I started by de-rotating each AVI using a stacked image of the original AVIs as the reference image.

Anyway all this took ages so good job I had a sick day yesterday (!) - oh and not helped by discovering that de-rotating doesn't work when your original captures are upside-down :embarassed:

Jim

Hi Jim, sorry do you mean you did a video de rotation to begin with ? I understand the benefit of using 1 min seqences over a 3 min red would be to take out the rotation, of the 3 min red sequence, using de rotation of images. And then combining the 3 reds. and de rotating all 3 RGBs ( done in the same way ) now finally ending with using de rotate rgb frames.

Your reference frame would have to be chosen near the begining Jim, to do a start time input. if quality selection was used anywhere in the stack this likely wouldnt work as the begining frames would be re sorted ? Sorry i am trying to understand your process. It certainly looks like its worked. Very detailed image.

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jimness

jimness

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Hi Jim, sorry do you mean you did a video de rotation to begin with ? I understand the benefit of using 1 min seqences over a 3 min red would be to take out the rotation, of the 3 min red sequence, using de rotation of images. And then combining the 3 reds. and de rotating all 3 RGBs ( done in the same way ) now finally ending with using de rotate rgb frames.

Your reference frame would have to be chosen near the begining Jim, to do a start time input. if quality selection was used anywhere in the stack this likely wouldnt work as the begining frames would be re sorted ? Sorry i am trying to understand your process. It certainly looks like its worked. Very detailed image.

Hi Neil,

Yes, I de-rotated the AVIs as a first step - although as this process requires a reference image, I made that reference image by just stacking the non-derotated avi.

And yes, I chose a reference frame near the beginning in AS!2 - but then I had run these AVIs through Castrator first. Does Castrator re-sort the frames? (I didn't think so...?)

Jim

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neil phillips

neil phillips

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Hi Neil,

Yes, I de-rotated the AVIs as a first step - although as this process requires a reference image, I made that reference image by just stacking the non-derotated avi.

And yes, I chose a reference frame near the beginning in AS!2 - but then I had run these AVIs through Castrator first. Does Castrator re-sort the frames? (I didn't think so...?)

Jim

I dont think it does Jim. So yes your process is good i understand now. sorry i wasnt sure of what you meant. great Job. this is the best de rotate avi ive seen. though i havent seen many.

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jimness

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Hello all, here's an image from a little later - 2 mins per channel this time. Oh and I decided to put the skew back on the planet, because.....well, just because.

Not sure if it's any better than the first one but take your pick!

Jim

8204384222_134b5d4b90_o.jpg

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neil phillips

neil phillips

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Hello all, here's an image from a little later - 2 mins per channel this time. Oh and I decided to put the skew back on the planet, because.....well, just because.

Not sure if it's any better than the first one but take your pick!

Jim

8204384222_134b5d4b90_o.jpg

Youve had a great night Jim, thats just wonderful. just love the detail and natural processing.

How did you de rotate this one Jim ? was it a video de rotate again ?

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jimness

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Youve had a great night Jim, thats just wonderful. just love the detail and natural processing.

How did you de rotate this one Jim ? was it a video de rotate again ?

Thanks again.

Yes, exactly the same process. I wasn't certain the AVIs needed derotating with just 2 mins but I thought I'd do it anyway as it wouldn't do any harm. Then the same RGB derotating too.

This one was a slightly 'cleaner' set - with the 3 min ones, SharpCap crashed on the Green (I think?) channel, so I ended up doing it again some minutes later - meaning the whole set of captures covered a good 12 minutes or so. But these 2 min ones were all done in quick succession so less derotation was needed, which I think has improved the limbs slightly.

13fps by the way, I think (Exposure -4 in Sharpcap) and a cheapo 3x Barlow. I have a Televue x2.5 but find the larger image size of the x3 outweighs the brighter exposure of the x2.5.

Jim

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