Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

ollypenrice

My 'Happy Christmas' dataset's here.

Recommended Posts

Hi All, once again it's been a great pleasure to share this passion with SGL friends so I'd like to say a small thanks to everyone by posting a link to some data we shot here this year. It's all yours to have a play with - just try not to show me up! :icon_mrgreen:

It's from the TEC140 Triplet Apo/Mesu 200/Atik 460 mono rig working at about 0.9 arcseconds per pixel, cropped to reduce file sizes and aligned to fit together in Registar. You'll find LRGB and Ha in the link, though the Ha is a bit of a token gesture at 2X40 minutes. However, I found I could use it to give a hint of the star forming regions.  There are no short subs for the central core but I found I could use the RGB layer as a substitute since the core was quite subdued in that set.

I hope this Dropbox link will work for you. 

https://www.dropbox.com/sh/pxrxxtkr6khwvsf/AADNDoXJZh4t7zjI3LdIirjea?dl=0

Have a great Christmas wherever you are and let's look forward to all those incoming photons in 2019...

Olly

Edited by ollypenrice
Link seems OK after all.
  • Like 15
  • Thanks 12

Share this post


Link to post
Share on other sites

That is a nice gesture ?

A Merry Christmas to you too, Olly. 

Steve 

Share this post


Link to post
Share on other sites
1 minute ago, FLO said:

That is a nice gesture ?

A Merry Christmas to you too, Olly. 

Steve 

Thanks Steve. Yours is the firm for nice gestures if ever there was one. Have a good break yourselves though I guess you must be just a bit busy at the moment!

Olly

  • Like 1

Share this post


Link to post
Share on other sites

thanks Olly, happy Christmas and a fruitful new year to you and all, from cloudy south wales. ?⭐⬆️. charl.

  • Thanks 1

Share this post


Link to post
Share on other sites

Thanks so much, Olly!

Dropbox link works fine for me.

  • Like 1

Share this post


Link to post
Share on other sites
19 minutes ago, AKB said:

Thanks so much, Olly!

Dropbox link works fine for me.

Great, I'm an IT numpty so that's a relief!

Olly

Share this post


Link to post
Share on other sites

Thanks for the early Christmas present Olly, it will give a reason to use DropBox as they keep threatening to cut me off from lack of use.

Merry Christmas :icon_rendeer:

Dave :icon_santa:

  • Like 1

Share this post


Link to post
Share on other sites

Work fine for me too. Just playing with the LUM now...

image.thumb.png.54fa18474ba7fc33148b8b7914fc8b0d.png

  • Like 1

Share this post


Link to post
Share on other sites
27 minutes ago, Davey-T said:

Thanks for the early Christmas present Olly, it will give a reason to use DropBox as they keep threatening to cut me off from lack of use.

Merry Christmas :icon_rendeer:

Dave :icon_santa:

Yer not supposed to open it till Christmas day!

Olly

  • Like 1
  • Haha 2

Share this post


Link to post
Share on other sites

Well, by no means up there with the best, but here's one I've produced today.

I'm still on the learning curve, but I would be extremely happy with this if I had produced it from scratch.

Still have lots to learn.

LRGB_Combined_PS.thumb.png.fc6927b8a1cee191412ccc1215ecb88a.png

 

 

  • Like 3

Share this post


Link to post
Share on other sites

Thanks Olly..very kind gesture of you...

Most of us are about to have cabin fever and the weather's not been helping much lately..

Merry Christmas to you too

Share this post


Link to post
Share on other sites
3 minutes ago, newbie alert said:

Thanks Olly..very kind gesture of you...

Most of us are about to have cabin fever and the weather's not been helping much lately..

Merry Christmas to you too

Honesty compels me to admit that it isn't helping me either!!!

Olly

Share this post


Link to post
Share on other sites

Thanks Olly, very kind, it'll give us in the UK something to do until the cloud clears... (partly my fault I know) Is that the same data you used in your Astronomy Now article? 

Merry Christmas to you

Dave

Edited by Laurin Dave

Share this post


Link to post
Share on other sites

That is lovely clean data, Olly.

 

I used CCDStack to make an L HaR G B, and did a bit of sharpening on the brighter areas in the Gimp with GMIC.

 

I'd be chuffed to bits if I could acquire such data myself.

 

 

OllysM51.jpg

  • Like 1

Share this post


Link to post
Share on other sites
11 hours ago, Laurin Dave said:

Thanks Olly, very kind, it'll give us in the UK something to do until the cloud clears... (partly my fault I know) Is that the same data you used in your Astronomy Now article? 

Merry Christmas to you

Dave

Yes, exactly the same for the refractor part of the article.

Olly 

  • Thanks 1

Share this post


Link to post
Share on other sites
11 hours ago, michael.h.f.wilkinson said:

Thanks Olly! Lovely data to work with.

Bit too noisy in the background, will handle that later

On this camera's data, Michael, I've evolved a technique for NR in the background. There seem to be a lot of dark background pixels for some reason so I find a brighter one and pin the curve at that point and above it, then lift the curve below it. This avoids pixel to pixel communication and so dodges the smoothed look of blurring alogorithms. This won't work on images containing darker-than-background dusty features, of course.

Olly

  • Like 1

Share this post


Link to post
Share on other sites
1 hour ago, ollypenrice said:

On this camera's data, Michael, I've evolved a technique for NR in the background. There seem to be a lot of dark background pixels for some reason so I find a brighter one and pin the curve at that point and above it, then lift the curve below it. This avoids pixel to pixel communication and so dodges the smoothed look of blurring alogorithms. This won't work on images containing darker-than-background dusty features, of course.

Olly

I had been experimenting with curves a bit in a similar way, but wasn't that satisfied with the results. I think I will apply some filters we have developed at work for this. They can readily remove small speckle structures without affecting larger ones

  • Like 1

Share this post


Link to post
Share on other sites
1 hour ago, ollypenrice said:

On this camera's data, Michael, I've evolved a technique for NR in the background. There seem to be a lot of dark background pixels for some reason so I find a brighter one and pin the curve at that point and above it, then lift the curve below it. This avoids pixel to pixel communication and so dodges the smoothed look of blurring alogorithms. This won't work on images containing darker-than-background dusty features, of course.

Olly

I've just tried that, and it works brilliantly!

Do you use this early in processing, or at the final stages?

  • Like 1

Share this post


Link to post
Share on other sites
24 minutes ago, don4l said:

I've just tried that, and it works brilliantly!

Do you use this early in processing, or at the final stages?

Fairly early. I stretch luminance in a conventional way in Levels  until I've got the background up to about 19 or 20 as measured in Photoshop. (I would far rather stretch to a higher background like the 23 I can easily reach with my Atik 11000 data but this camera just won't get there without being blown out eleswhere.) At this point the fainter details and even middle range brightnesses will still have more to give but I stop and do the procedure I outlined above. Thereafter I continue to stretch but with the curve pinned at the 19 or 20 and below so that  the background never gets any more stretching. There is no point in lifting further up above the noise floor.

I'm glad the trick worked for you. I do a number of custom noise reduction procedures based on zooming in to pixel scale to see what's going on. The colour select tool is good for picking up similar rogue pixels which can then be fixed using other tools like saturation, colour balance or the Median filter. This can be less invasive then generic noise reduction but it assumes you can spot a noise pattern at pixel scale. Sometimes you can, sometimes not.

Olly

Share this post


Link to post
Share on other sites

Many thanks Olly much appreciated + something to work on whilst waiting for Santa!

Thanks for your help recently + Happy Christmas & Best Wishes for clear skies in 2019. ⭐?

Graham   

Edited by groberts
  • Like 1

Share this post


Link to post
Share on other sites

Many thanks from me as well, ?lly.

I wish I could say that I've put your present with all other presents underneath the Christmas tree. But it's actually sitting on my harddrive, waiting for Christmas morning.

All the best wishes to you, and hopefully many clear nights in 2019.

  • Thanks 1

Share this post


Link to post
Share on other sites

Downloaded, may have a play and see what I can do with serious data and more than one file.

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By EyeGuy
      This is from a couple of nights ago.
      It clouded in quickly, so I didn't get much data. The temp was 2C, and I'm self-isolating - so that was also a factor! I only took 5 darks before I gave up and went to bed. I'll take more when the temp is right.
      This is 140 min integration time on a new Canon EOS Ra with 17x500s exposures, and no filter (from the city).
      Processed in PI and Photoshop - I should have used more star masks but the data aren't good enough to warrant the effort I think. I also had difficulty with flats - I tried a range of exposures with a Gerd Neumann panel, but I think they were all too short. Will go longer than 0.3s next time - very hard to figure out flat exposure on DSLRs, and APT's tool doesn't work for DSLRs yet.
      I think I'm obsessed with M51 - and I know I'll be back to it again.
      Stay safe everyone,
      Barry
       


    • By knobby
      First attempt at any DSO other than the brighter stuff like M42 or Andromeda.
      Learning to use the AZ-Gti /Sharpcap polar align / windows synscan app / APT platesolving ... And guiding ! all in one night ?
      all went well so had a quick 30 mins on M51 (first time I'd ever managed to actually frame it ... Plate solving is amazing)
      90 second subs gain 420 and 5 darks and synthetic flat for dust bunnies / gradients
      Wish I'd have gone longer now as tried a 5 minute sub once guiding was working which looked good .
      Very noisy but only 30 mins .

    • By alan4908
      I decided to try to maximize detail by collecting a large quantity of Luminescence data and then applying strong deconvolution to the areas of high signal to noise.  I also decided to try out Mure denoise, a Pixinsight routine that reduces camera noise.  The final result is an LRGB and represents just over 17 hours integration time. 
      I hadn't noticed before the rather strangely shaped fuzzies in the backgroud - have a look at the annotated version for IC4278 and the triangular shaped galaxy PC2292105. 
    • By alan4908
      Yet another attempt at the Whirlpool galaxy (M51).
      This time, I decided to try to maximize detail by collecting a large quantity of Luminescence data and then applying strong deconvolution to the areas of high signal to noise.  I also decided to try out Mure denoise, a Pixinsight routine that reduces camera noise.  The final result of this LRGB processing approach is shown below and represents just over 17 hours integration time. 
      I hadn't noticed before the rather strangely shaped fuzzies in the backgroud - have a look at the annotated version for IC4278 and the triangular shaped galaxy PC2292105. 
      Alan
      LIGHTS: L:46, R:20, G:23, B: 15 x 600s; DARKS:30, BIAS:100, FLATS:40 all at -20C. 

       

    • By lalou
      Hi All. Need your help on my first try at M51. After stacking around 1 hour+ of 2 mins exposures this is what I got. I wasn't able to use darks and flats because I had a problem with the darks that I took during that night. I'm getting a slight red tone on the background when I enhance with levels and curves in Photoshop. I took the image in a fairly dark site but I used a UHC filter to see if it has any help on the image. My equipment is a Celestron C6N reflector, Nikon D90, and a Baader UHC filter.
       
      Thanks!

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.