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Posts Made By: Gianluca Valentini

March 1, 2006 06:51 PM Forum: CCD Imaging and Processing/Solar System

Is more frames always better?

Posted By Gianluca Valentini

Hello guys,

I believe the question is pretty clear from the subject: is it always better to stack more frames? Is there a trade off between quantity and quality and where should it be placed. I have manually selected the stack for some of my images and I must admit that the difference in the outcome hardly justified the effort of the manual selection. Is it a problem with my images or is it like this even for you guys?

I always thought that a few hundred frames were more than enough, but I hear that somebody captures several thousands and stacks thousands of frames to get a better S/N ratio. But doesn't the image quality degrade if some of the images stacked are of poor quality? I'd love to hear what you guys have to say about this, if anything.


Ciao

Luca 8)

March 5, 2006 09:45 PM Forum: CCD Imaging and Processing/Solar System

Which one?

Posted By Gianluca Valentini

Hello guys,

I made this 2 LRGB with a different techinque from the same 2 pictures. which one is better? A or B?

Thanks for you replies.

Luca

March 17, 2006 09:43 AM Forum: CCD Imaging and Processing/Solar System

Not much to work on, so....

Posted By Gianluca Valentini

Alas, when it's not raining, the seeing doesn't cooperate, so, not to get rust on my equipment and myself wink I decided to try the full moon with the 102 Tak at F8 and Infinity with my new Baader IRpass filter. It did not help much since the image was quivering and boiling even with the filter at F8 :C

But at least I practiced my "mosaic-ing" with PS.

Each of the 4 sectors has been obtained by stacking 75 frames out of 100, aligned only on 1 point, but I must say that I've seen worse wink. Original has been down-sized approx. 30%.

Ciao guys

Luca

March 22, 2006 07:26 PM Forum: CCD Imaging and Processing/Solar System

Re: Low alt Jupiter

Posted By Gianluca Valentini

Hello Robert,

considering Jupiter's incredibly low altitude your result is astonishing.

I believe the colour is just fine, so I would stop searching for better settings.

Congrats again Robert: I might ask you to send me those settings since they are much better than mine wink


Ciao
Luca

April 3, 2006 11:14 PM Forum: CCD Imaging and Processing/Solar System

H-alpha before the storm

Posted By Gianluca Valentini

Hello all,

I managed to catch some of the unexpected h-alpha activity today and while I was filming I could hear thunders rumbling: I was able to shoot a few sequences and I just processed the 1st one. Since it came out better than I thought I will post it. I plan to manually align it as soon as I can grin

Active area 0865
UTC 11:58
100/1000 frames with Infinity 2-1
Registax (I aligned fits files captured with Streampix) & PS for false color

Ciao all

Luca 8)

April 5, 2006 05:24 PM Forum: CCD Imaging and Processing/Solar System

Flare sequence

Posted By Gianluca Valentini

Hello

unexpectedly, through the upcoming storm clouds, I was able to capture this very bright flare within NOAA 10867 at 12:03 UTC. The image is not good as it has been crudely processed from single frames (except for the flare one that is obtained stacking 14 of the best and lighter of the 296 I could capture before it all went dark sad ).
A few minutes later the clouds opened up again for a short while and the phenomenon was almost completely gone.

Too bad I was not able to capture the whole thing properly as it went on >sad >sad I just hope I can document the aftermath with the rest of the sequences.

Ciao all

Luca 8)

Ciao

Luca

April 6, 2006 03:21 PM Forum: CCD Imaging and Processing/Solar System

NOAA 10865 and associates

Posted By Gianluca Valentini

Hello everyone,
here is another shot from april 3rd. It shows all three active areas of that day (thank Lumenera for big CCD chips!).
It can be noticed also that the 867 is beginning to produce a flare that I was able to document only in part since a thick layer of clouds moved in just at the right/wrong time to hide the event >sad I will process later a movie captured 6 minutes after this to see how the flare looks there.

The 865 looks like a giant spider that's captured a prey and it's wrapping it in its its web to store it for a later meal. A caterpillar (the 867) is watching the scene from a distance grin

Ciao all

Luca

PS there is a strange line running through the image from top right down: it is certainly an artifact but I don't know what it is. I'll investigate.....

April 11, 2006 09:47 AM Forum: CCD Imaging and Processing/Solar System

Question for Harald

Posted By Gianluca Valentini

Hello Harald,
some time ago you posted a way to calculate the size of earth in comparison to the sun: would you be so kind to post it again since I can't find it?

Thanks Harald

Luca

PS I seize the occasion to post a late image of NOAA 10865
April 4th, UTC 1227, 100/1000 at F27 frames aligned&stacked in Registax aligned on 2 points with new multialign option grin grin (pre-beta Registax version: courtesy of mr. Cor Berrevoets grin )

April 12, 2006 10:09 PM Forum: CCD Imaging and Processing/Solar System

A prominent Sunday

Posted By Gianluca Valentini

Hello guys,

Sunday I checked out the sun in the late afternoon to catch a last glimpse of the huge NOAA 10865. It was almost gone sad But there were some interesting prominences that I believe have been already posted here. These are my attempts.

Ciao all

Luca

April 18, 2006 09:32 AM Forum: CCD Imaging and Processing/Solar System

The sun a few days ago

Posted By Gianluca Valentini

Alas the conditions of the weather have been bad and when the sun was out the seeing was dreadful.
Thank God I kept some of the sequences I captured on the Apr 3rd and so I have something to process, waiting for better days.

Here is a picture of NOAA 10865, 10866, 10867 taken on apr 3rd at 12:07 UTC with my Infinity; 100/1000 frames stacked in Registax (pre-beta with 4 points multialignment) and processed in PS. Hope you enjoy it even if a bit outdated.

Luca