Recent Posts

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1
Gallery / Re: Wizard Nebula Bicolor HaHOO
« Last post by rdryfoos on Today at 20:10 »
Hi,

I also do really like your rendition of the wizard nebulae with fine and sharp details!

Well done!

Lex.
  Thanks Lex.  I think I prefer the SHO palette better however.
Rodd
2
Gallery / Re: IC-443 in HaSHO
« Last post by rdryfoos on Today at 20:08 »
Nice, I assume you used 3nm filters?
Which camera?
  Wow--how did you know?  I use the SBIG STT 8300 with the self guiding filter wheel. 

Rodd
From what I have seen so far I noticed that the 3D effects of the images is better when the filters bandwidth is smaller.
Since I found it having a nice 3D effect I assume very small (hence 3nm?). it's not a science just what I use to see when checking images and their equipment.
  That's an interesting approach.  Your right.  I am aware that the filters, though passing less signal, actually provide for a stronger signal because of a higher SNR (That's off of the Astrodon page).    I do like the Astrodon 3nm better than the baader 7nm.  But Baader now makes a 3.5nm, which is much less expensive than the Astrodon. 
Rodd
3
Gallery / Re: IC-443 in HaSHO
« Last post by OldSkyEyes on Today at 19:45 »
Nice, I assume you used 3nm filters?
Which camera?
  Wow--how did you know?  I use the SBIG STT 8300 with the self guiding filter wheel. 

Rodd
From what I have seen so far I noticed that the 3D effects of the images is better when the filters bandwidth is smaller.
Since I found it having a nice 3D effect I assume very small (hence 3nm?). it's not a science just what I use to see when checking images and their equipment.
4
Image Processing Challenges / Re: M31's problem
« Last post by Raymond on Today at 18:29 »
Hi
Here a short description of my workflow for your image:

- Dynamic Crop;
- DBE avoid putting samples in the halo of the galaxy;
- to reduce the noise: MLT on the first three layers using a 50% gray mask;
- Histogram Transf. to stretch the image; with a few corrections in the G and B channel;
- HDRMT layers: 6; check lightness and L. mask; structures near core get visible;

creation of a) L-mask (clipping background and using some convolution)
make a copy of this mask and delete the large scale structures using MLT and deleting all layers above 7 (incl.)
Using Pixelmath, substract the second mask from the L-Mask and you get a
b) mask for the galaxy (you can slightly blurr it using convolution);

With the Galaxy-Mask, you can stretch M31 using Curves - but not too much, as the halo is really faint.
You can use Local Hist Equal to enhance the structures in the halo and near the core.

With the L-Mask applied, use Curves to do some saturation of the colors of the stars and the galaxy. Again, not too much, as the outer parts of the halo have low SNR.
If the background seems to bright for you, you can also invert the mask and decrease the brightness of the background.

I applied no further noise reduction or sharpening on the image.
What's the exposure time for your image? I guess, having more subframes would help you in getting a better halo for M31.

I hope this can give you some ideas of how to process your image.
Raymond




5
General / Re: Mure Denoise Settings
« Last post by jerryyyyy on Today at 17:55 »
Hi,

Found this is a very useful post and thought I would add a couple questions.  I am working on a project involving M67 and have 74 HA and 91 O-III images in addition to 20 each RGB for stars.  The HA comes out well and we realize the O-III is a weaker signal but are managing to just see the outer ring (3rd one). Mure definitely helps and I have appreciated that the stacking uses Lanczros 3 from thge auto setting of BPP.  I assume there is a reason BPP decides to use this.  My images are WEIGHTed in subframe selector. 

I also noted watching the BPP run that the noise levels for the individual frames runs 7-8 e-04.  Does this relate in any way to the Gaussian Noise setting?  I am running an STT 8300M and in the past we have used 30.36.  Gain is 0.4.

This all reminds me I need to change out those Baader filters for Astrodons.... 
6
Gallery / Re: IC-443 in HaSHO
« Last post by kolec on Today at 16:09 »
Verry nice, only violet I dont like

kolec
7
General / asking advice about ubuntu vs Windows 10 version
« Last post by astroedo on Today at 15:31 »
Hi all,

I'm formatting and reinstalling my old notebook.

It is an ASUS notebook with a INTEL CORE DUO processor and 4 GB RAM + 1 GB Graphic RAM.
My main O.S. is Windows 10 64 Bit where PixInsight runs decently and I'm happy about it, but I was evaluating the idea of making a multiboot system with Ubuntu (or Xubuntu, Lubuntu that seems lighter for my old machine).

- Has someone tested Linux PI Version compared with windows version on the very same machine?
- Which system has better performances? (If one in better than the other)
- In your opinion, is my idea good or fool?
- Are there other Free Linux distributions more suitable for this job?

Thank you in advance for your help.

Edoardo
8
Gallery / Re: IC-443 in HaSHO
« Last post by rdryfoos on Today at 13:26 »
Here's with a higher black point.  I am attempting to be less aggressive with my sharpening for a more natural look.  Sometimes its hard to tell if its an improvement. 

9
Gallery / Re: IC-443 in HaSHO
« Last post by rdryfoos on Today at 10:17 »
Nice, I assume you used 3nm filters?
Which camera?
  Wow--how did you know?  I use the SBIG STT 8300 with the self guiding filter wheel. 

Rodd
10
General / Re: Pixelmath - replacing clipped pixels
« Last post by Niall Saunders on Today at 10:11 »
No need to 'link to me' - a link back to the PixInsight Home Page is more than good enough.

Glad you found a solution (oh, and "nice end result", by the way  ;))
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