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The shrinking GRS on morning of the 28th (With picture).

Barv

By Barv
in Imaging - Planetary

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Barv

Barv

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Reasonable seeing here last night unfortunately ruined by gusty conditions. I was lucky to be able to get this image from my data. Managed 111FPS luckily otherwise I would have been forced to pack up!


 


Regards


Harvey

post-32779-0-47276400-1419800960.png

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Barv

Barv

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Thanks for your comments Guys.

Freddie.

I agree with you, the transition from the C11 to the 14 is not going as well as I'd hoped. The data looked promising on the avi but was extremely difficult to process. I think the seeing needs to be so much better with the larger aperture as it's not finding it's way through the seeing pockets as well as the 11". It was a little windy aswell so I was limited to around F15.

Regards

Harvey

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Barv

Barv

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What does the image look like after stacking Harvey? Have you a raw TIFF to post up?

Great idea Stuart!

I think, hoping it will be my rusty processing! Neil suggested I PM him after the hols, but I'm sure he won't mind.! 

Here you go. Perhaps you can PM me afterwards?

Regards

Harvey

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neil phillips

neil phillips

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Had a quick play, bit busy at the mo trying to clear data off the pc I  am sure better could be done.

But there are numerous  problems with the original image Harvey. levels are way too low. colour too strong. noise reduction too strong. ect

Not sure what histogram your capturing your avis at. But it looks way to low here. yes you can increase levels later. But quality will suffer more that way. It needs to be set correct at capture. When I have more time I will pm. Hope I am helping.

anyway heres a comparison. Hopefully others will chip in. Stuart any thoughts ?

post-2700-0-17950400-1419876425.png

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Barv

Barv

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Had a quick play, bit busy at the mo trying to clear data off the pc I  am sure better could be done.

But there are numerous  problems with the original image Harvey. levels are way too low. colour too strong. noise reduction too strong. ect

Not sure what histogram your capturing your avis at. But it looks way to low here. yes you can increase levels later. But quality will suffer more that way. It needs to be set correct at capture. When I have more time I will pm. Hope I am helping.

anyway heres a comparison. Hopefully others will chip in. Stuart any thoughts ?

attachicon.gifharvey.png

Hi Neil, many thanks.

Spent the whole day processing yesterday and image was posted with very tired eyes. So I am sure you are right. With regards to the capturing though I am a little confused Neil? - I use Sharpcap at the moment and usually aim to get the histo slightly lower than mid-point. Any more than this and the image is too bright with over exposed pixels, so I am unsure of what I can really do about that? 

I've just posted up another one. Let me know what you think Neil.

Regards

Harvey

Regards

Harvey

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neil phillips

neil phillips

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Yes as mentioned, there are numerous processing decisions in the original image, that have not helped it I don't think. Clearly following a processing regime away from the original one. would help a lot. There is clearly better data there. Though the histogram at capture seems to be set too low.  Regardless there is still better data here.


 


My advice to Harvey would be to re read everything you and I have said to him. And to try to follow more closely what we have said. The levels can not be set to low. sharpening and noise reduction needs to be done correctly on and and on. Its ok to think on your feet and try your own ideas. But when everything is going wrong it helps to start right back at square one.


But if in doing that advice is not followed. there is little more I can help with. If you would like me or anyone else on here to post a processing quide line. I will try. But it would have to be followed closely or there is little point.


Again hope I am helping. Btw I prefer your go Stuart slightly less detail in certain areas. But looks more natural than mine. Its interesting how close our processing is. Ether we are doing something wrong. Or we are doing something right.


As we have both ended up choosing our own ways, I can assure everyone of that. But they look very close indeed.


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neil phillips

neil phillips

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Its a tricky one monitors. But it looks fine here. and I thought my monitor was bright.

As for capturing levels. I had to set histogram a lot higher tpo get the levels up. the stack has come out very low. ive noticed that before in your images. personally I would set the histo to around 70%  I tend to do it by eye for my captures. the first thing that will blow out is the white clouds in the centre of the planet. Ideal histogram. is just shy of that happening. For me its around 70% roughly. Though I do alter that figure lower and higher depending on the situation

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Barv

Barv

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Its a tricky one monitors. But it looks fine here. and I thought my monitor was bright.

As for capturing levels. I had to set histogram a lot higher tpo get the levels up. the stack has come out very low. ive noticed that before in your images. personally I would set the histo to around 70%  I tend to do it by eye for my captures. the first thing that will blow out is the white clouds in the centre of the planet. Ideal histogram. is just shy of that happening. For me its around 70% roughly. Though I do alter that figure lower and higher depending on the situation

Cheers Neil.

I will always take note of advice as I am dedicated. It was windy on capture so I probably ran the wrong move and deliberately sacrificed  histo levels for speed of capture. I will try and up the histo. I seem to be getting more problems than with the C11, - unsure why.

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neil phillips

neil phillips

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Cheers Neil.

I will always take note of advice as I am dedicated. It was windy on capture so I probably ran the wrong move and deliberately sacrificed  histo levels for speed of capture. I will try and up the histo. I seem to be getting more problems than with the C11, - unsure why.

We all get problems from time to time. Switching to large optics can be more troublesome than many think. Especially mass produced Newtonians. I have only captured 3 or 4 I am happy with my 300p

Lightning frame rates I am not sure about. They do help beat seeing for sure. But can increase other problems. sacrificing good levels for frame rate, is not always a good idea. Most people don't realize histo really can be set by eye. Its not scientific No, but it can be done.  And its surprisingly easy. Just raise the gain until the centre white clouds blow out on Jupiter. Then lower slowly until all the blow out disappears.  Most would suggest paying  attention to histo levels using a meter though agreed.  If a big scope is not performing. things I would look at, are collimation. Cooldown. focusing, and seeing conditions.

I will Pm you at some point, and see if we can work through any problems. Please bare with me. I am still wondering if to go out tonight, have a ton of data from yesterday, and the day before.

Looking at mine and Stuarts re dos, I think the problems are not as bad as I first thought.  You could sort this out I reckon. Speak soon

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