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Stacking...?
Hi Chaps
I had a bash at taking a bunch of 10 second exposures of M13 the other day, then tried registax to stack them.... The result was worse than the best frame! Could this be because i did not pick the best frames from the bunch ? Thanks Rob -- ________________________ http://robert.thegeakes.co.uk/ 51:21N 00:23E |
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Re: Stacking...?
On Tue, 8 Jul 2003 13:35:47 +0000 (UTC), "Robert Geake"
<rob@thegeakes.co.uk> wrote: >Hi Chaps > >I had a bash at taking a bunch of 10 second exposures of M13 the >other day, then tried registax to stack them.... > >The result was worse than the best frame! >Could this be because i did not pick the best >frames from the bunch ? Can you give any idea what they look like? Ideally, a link to them? -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy |
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Re: Stacking...?
Both tries are linked below...
Most images are at least half a meg..Sorry! Result = 0result.jpg for both cases... http://robert.thegeakes.co.uk/astro/m27/ http://robert.thegeakes.co.uk/astro/m13/ Rob "Pete Lawrence" <pete.lawrence_nospam_@pbl33.co.uk> wrote in message news:bnmlgv0lmrsursfelcs8pg63asihl16nj1@4ax.com... > On Tue, 8 Jul 2003 13:35:47 +0000 (UTC), "Robert Geake" > <rob@thegeakes.co.uk> wrote: > > >Hi Chaps > > > >I had a bash at taking a bunch of 10 second exposures of M13 the > >other day, then tried registax to stack them.... > > > >The result was worse than the best frame! > >Could this be because i did not pick the best > >frames from the bunch ? > > Can you give any idea what they look like? Ideally, a link to them? > > -- > Pete > Homepage at http://www.pbl33.co.uk > CCD/digicam astronomy |
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Re: Stacking...?
On Tue, 8 Jul 2003 15:33:58 +0000 (UTC), "Robert Geake"
<rob@thegeakes.co.uk> wrote: >Both tries are linked below... >Most images are at least half a meg..Sorry! >Result = 0result.jpg for both cases... > >http://robert.thegeakes.co.uk/astro/m27/ >http://robert.thegeakes.co.uk/astro/m13/ M27 or M57? If I don't get the call of the pub tonight (heh heh heh - unlikely) I'll have a look - I've downloaded them all... -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy |
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Re: Stacking...?
"Rob Pollard" <robertapollard@hotmail.com> wrote in message news:beeru1$49njm$1@ID-96892.news.dfncis.de... > Hi Rob, > Check your inbox  Just had a go at processing the M13 images and I've> sent my results. Overall the images are quite noisy, which limits what you > can do with them. I found the best way of stacking it was to use a Median > combine and not a sum combine. This way the noise levels are vastly reduced. > Also if you look at the histograms of the images on your website, there is > room for improvement simply by moving the black and white points. Hope this > helps. > > BTW M27 looks suspiciously like M57!! Doh! > > -- > Regards > Rob Pollard > > My Astro CCD page is: > http://www.robpol.demon.co.uk > > "Robert Geake" <rob@thegeakes.co.uk> wrote in message > news:beeo95$leu$1@hercules.btinternet.com... > > Both tries are linked below... > > Most images are at least half a meg..Sorry! > > Result = 0result.jpg for both cases... > > > > http://robert.thegeakes.co.uk/astro/m27/ > > http://robert.thegeakes.co.uk/astro/m13/ > > > > Rob > > > > "Pete Lawrence" <pete.lawrence_nospam_@pbl33.co.uk> wrote in message > > news:bnmlgv0lmrsursfelcs8pg63asihl16nj1@4ax.com... > > > On Tue, 8 Jul 2003 13:35:47 +0000 (UTC), "Robert Geake" > > > <rob@thegeakes.co.uk> wrote: > > > > > > >Hi Chaps > > > > > > > >I had a bash at taking a bunch of 10 second exposures of M13 the > > > >other day, then tried registax to stack them.... > > > > > > > >The result was worse than the best frame! > > > >Could this be because i did not pick the best > > > >frames from the bunch ? > > > > > > Can you give any idea what they look like? Ideally, a link to them? > > > > > > -- > > > Pete > > > Homepage at http://www.pbl33.co.uk > > > CCD/digicam astronomy > > > > > > |
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Re: Stacking...?
"Robert Geake" <rob@thegeakes.co.uk> wrote in message news:beehbi$hl9$1@sparta.btinternet.com... > Hi Chaps > > I had a bash at taking a bunch of 10 second exposures of M13 the > other day, then tried registax to stack them.... > > The result was worse than the best frame! > Could this be because i did not pick the best > frames from the bunch ? > Here's my attempt on M57 only, lifes too short to wait for M13 on a dial up :-( http://www.leadbeaterhome.fsnet.co.uk/M57_temp.htm Aligned and stacked with k3ccdtools Low histogram point set to reduce noise High histogram point set to stretch contrast Gamma increased to 1.8 to stretch faint detail Red curve tweaked in photoshop to bring out colours in ring Robin |
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Re: Stacking...?
Wow,
When i go to sleep tonight i will have pictures of M13 and M2757 burned onto my retina. Thanks for the response, if it where a competition i think Pete.L would be the winner, they are all better than mine. I was hoping some one would use Photoshop, i have used that alot. I have read about stacking with this app but never tried it. It saves me from "learning" a new bit of software. I will give it a bash tomorrow and post the results.. Thanks Gents R "Robert Geake" <rob@thegeakes.co.uk> wrote in message news:beehbi$hl9$1@sparta.btinternet.com... > Hi Chaps > > I had a bash at taking a bunch of 10 second exposures of M13 the > other day, then tried registax to stack them.... > > The result was worse than the best frame! > Could this be because i did not pick the best > frames from the bunch ? > > Thanks > > Rob > > -- > ________________________ > http://robert.thegeakes.co.uk/ > 51:21N 00:23E > > |
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Re: Stacking...?
On Tue, 8 Jul 2003 21:01:42 +0100, "Robin Leadbeater"
<robin_astro@nospamhotmail.com> wrote: > >"Robert Geake" <rob@thegeakes.co.uk> wrote in message >news:beehbi$hl9$1@sparta.btinternet.com... >> Hi Chaps >> >> I had a bash at taking a bunch of 10 second exposures of M13 the >> other day, then tried registax to stack them.... >> >> The result was worse than the best frame! >> Could this be because i did not pick the best >> frames from the bunch ? >> > >Here's my attempt on M57 only, lifes too short to wait for M13 on a dial up >:-( > >http://www.leadbeaterhome.fsnet.co.uk/M57_temp.htm > >Aligned and stacked with k3ccdtools >Low histogram point set to reduce noise >High histogram point set to stretch contrast >Gamma increased to 1.8 to stretch faint detail >Red curve tweaked in photoshop to bring out colours in ring Very nice Robin! -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy |
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Re: Stacking...?
Ahh, Exellent Smithers.....
http://robert.thegeakes.co.uk/astro/m13/00result.jpg (473kb) Rob "Robert Geake" <rob@thegeakes.co.uk> wrote in message news:beehbi$hl9$1@sparta.btinternet.com... > Hi Chaps > > I had a bash at taking a bunch of 10 second exposures of M13 the > other day, then tried registax to stack them.... > > The result was worse than the best frame! > Could this be because i did not pick the best > frames from the bunch ? > > Thanks > > Rob > > -- > ________________________ > http://robert.thegeakes.co.uk/ > 51:21N 00:23E > > |
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Re: Stacking...?
On Wed, 9 Jul 2003 09:32:39 +0000 (UTC), "Robert Geake"
<rob@thegeakes.co.uk> wrote: >Ahh, Exellent Smithers..... > >http://robert.thegeakes.co.uk/astro/m13/00result.jpg (473kb) > >Rob That's better Rob! -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy |
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Re: Stacking...?
On Wed, 9 Jul 2003 10:50:49 +0000 (UTC), "Robert Geake"
<rob@thegeakes.co.uk> wrote: >Just needed a kick up the jacks to get me >to actually try a manual stack! > >That image is only 6 frames as well... > >Only took about 30 mins as well, next time >i will set the digicam to ISO50, that should >reduce noise quite a bit. If you hadn't been brave enough to post a link to your original 'poor' (in the nicest possible way of course) attempts, you would not have ended up with the nice result you have. Sometimes we all need a kick up the backside to push us closer to excellence. (Sick buckets at the ready sir...!) -- Pete Homepage at http://www.pbl33.co.uk CCD/digicam astronomy |
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Re: Stacking...?
"Pete Lawrence" <pete.lawrencenospam@pbl33.co.uk> wrote in message > > Very nice Robin! > Thanks Pete. On reflection, I probably pushed it a bit too far for effect. I would rather be imaging though, but I guess it is something to do while waiting for some.... Clear Skies Robin |
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Re: Stacking...?
"Robert Geake" <rob@thegeakes.co.uk> wrote in message news:begs29$7hd$1@hercules.btinternet.com... > > Only took about 30 mins as well, next time > i will set the digicam to ISO50, that should > reduce noise quite a bit. > Hi Rob, Not sure what camera you have but if it doesn't do it automatically, it might be worth taking a stack of dark frames at the same time to subtract from each image. That might help with the noise too. Robin |
