Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Topics - astroedo

Pages: 1 [2] 3
Hi I've just published a simple processing workflow based on a picture from Goddchen M8 postprocessing contest.

It covers all the processing workflow in a simple way, good for beginners.

I hope you'll enjoy it

English version

Versione in italiano

As everyone knows PixInsight is a formidable tool for deep sky astrophotograpy processing: it gives to the imager a lot of tools that goes from preprocessing to the final touch on any astronomical picture.

Less knows that PixInsight is a powerful tool for planetary processing too.

This is the introduction of my latest processing example that shows how to create a lunar mosaic in PI with GradientMergeMosaic.

If you are interested please read here

and here the final result

General / using previews in pixelmath expression
« on: 2014 June 05 01:39:28 »
Hello all,

Is it possible to use previews in PixelMath expression?

For example I would like to evaluate the background of the image so I can use the median level of a patch of sky.
I would like to create a preview on my image an use it with the med (image) function of pixinsight without cloning the preview in a new image.



I've recently bought a set of narrow band filters and I'm trying to learn how to deal with this data.

I've found the Steve Cannistra method of composing Ha and OIII images and I've translated the full workflow in PI.
So I've written a simple tutorial on that.
Here a short abstract of the tutorial
Steve Cannistra technique takes advantage of some specific characteristics of Photoshop such as the use of layers, clipping masks, and blend modes that are not directly available in PixInsight but that can be reproduced fairly easily with PixelMath.

In the first part of this tutorial I will try to strictly reproduce the Steve Cannistra procedure in PixInsight, in the second part I will optimize it in order to better use the strengths of PixInsigth getting a considerably more efficient procedure.

If you are interested you can find it on my website with the full set of process icons downloadable

Per i miei connazionali è presente anche una versione in italiano

The tutorial is for beginners, but any advice for making it better from skilled people would be muck appreciate.

Cieli sereni


General / question about DBE symmetries
« on: 2014 April 16 04:56:50 »
A few month ago I posted a message in Image Processing Challenge.

Probably the forum section was not appropriate so my question ran mostly unanswered.

I try again here, hoping that someone could have the key for the solution.

Bye Edoardo

Bug Reports / Minor problem with readout mode
« on: 2014 March 27 14:33:10 »
Hi all,
I have a little problem with readout mode.

PI on Windows 7 64 bit

Sometimes (I cannot figure out exactly when)  the information window with the magnified view and intensity information of the readout mode completely disappear.

I've done a lot of test but the only way to make it work again is to Reset PixInsight Settings.



Image Processing Challenges / NGC2685 Noise Challange
« on: 2014 March 20 12:13:20 »
Hello to all the forum.

On march 8th, after many many week of clouds and rain I finally managed to get some light from the heavens  :D

Unfortunately the sky condition was quite bad: a bright half moon spreading light all around and a little bit of haze turning stars into balloons.
Despite this i got some signal from NGC 2685 the helix galaxy.

Unfortunately this signal is submerged by a lot of noise.

I've tried to handle it with TGVDenoise before and than MultiscaleMedianTransform (both on linear data) but I'm not completely satisfied by the result (look here

I would like to see what an experienced guy can do with my image and which are the better strategies to apply for noise reduction of this poor data.

Thank you


Image Processing Challenges / Playing with DBE Symmetries
« on: 2013 October 13 06:52:30 »
Hello all.
Today I was playing with an old Image.
My goal was to understand How DBE Symmetries work.
The image has a strong gradient due to lack of flat fielding.
Using DBE normally (without symmetries) I get a very good flattening in a couple of iterations, so my goal is only to understand how DBE Symmetry works and not flattening the image >:D.

My idea was to use a 20 points axial symmetry in order do get an almost circular synthetic  flat so I've set the samplin point as in Picture 1, but when I execute DBE I get an oval flat field and not a circular one (see picture 2).

If I crop my image makeing it square, with the same process icon, I get the expected result: a circular gradient (as seen in Image 3).

It is a sort of Bug or I'm doing something wrong?

Here you can find a zip file with my image and the DBE process icon.

I'm using PixInsight 1.8RC7 on windows 64 bit

Thank you


Gallery / Almost full moon
« on: 2013 September 21 04:34:57 »
Hi all.

Following Ingacio hints I've tried to process my latest moon picture completely in PI, the result is quite good so I want to share with you.

The only note in processing workflow is on StarAlign.

Since in a full moon the detail are softer than in a picture with a visible phase, I had to change the Peak response parameter, from the default value of 0,8 to 1 and the Detection scale to 8

With such changes the detected "stars" goes from 7-10 with the default parameters to almost 1000 with the modified parameters allowing a good align.

All the 30 images were perfectly aligned without errors!

Full processing workflow on AstroBin



Gallery / M33 Reprocessed
« on: 2013 September 19 02:57:34 »
Hi All,
I've completely reprocessed my Triangulum Galaxy.

You can find on AstroBin

In the Technical Card you can find the full PixInsight processing workflow.



Image Processing Challenges / Help for color balancing
« on: 2013 September 10 12:38:58 »
 Hello to all forum users.

I have a problem in color balancing the linked picture of NGC 7000.
The picture is a composition of 31x120 seconds calibrated shots.

The frames was took with my modified Canon 350D and a quite old Leitz Elmarit-R 180mm F/2.8 lens set @ F/4.

The main problem is that the dim Milky Way starlets  that fill the image are very very green and i cannot get a decent color balancing of both nebula and stars on the background.

SCNR makes the image much better, but it does not solve the problem completely

As last resort I was thinking to create a starmask or a range mask and desaturate this stars, but probably someone more skilled could do something better.

Here the dropbox link

Off topic: Someone has an Idea about why this stars are so green?

Thank you


Gallery / My Colorful moon
« on: 2013 August 19 09:23:42 »
After seeing Ignacio Moon here
it' really hard posting a moon image  :-[

But I would like to share with you my Moon detail.

The moon was only 23° over the horizon and the Atmospheric chromatic aberrarion was really evident (about three pixel between red and blue image)

Processed with Pixinsight 1.8 RC7 (deconvolution, HDRMT, curves and Color Improvement), it's a two panel mosaic composed with PS (is there a way do it with PixInsight?)

Registration and Stacking of 440 frames with Registax (only because i didn't know that i could try with PI  :embarassed: )

Gallery / Noisy M33
« on: 2013 August 14 08:44:15 »
Here's my view of M33, the triangulum galaxy, with my Canon 350D.
Unfortunately the temperature was very high (over 15°C) so the final image was VERY noisy.

I used TGVDenoise to deal with such a mess and the result is accetable (this is the first time that I use this tool)

Critics and suggestions are welcome.


Gallery / M81 - M82
« on: 2013 June 03 12:04:15 »
Hi to all forum users.

I recently had the chance to put my hands on a few raw data taken by my good friend Luigi Fontana.

I'm still climbing PixInsight learning curve and the top is still afar, but thanks to the help of many forum users now I'm out of the muddy plains of the very beginning  :) .

Here i present you an image of M81 - M82.

Is the composition of 22 x 600" exposures with a Modified Canon EOS 5D on a  Orion ODK 12" reflector.

All the processing was done in PixInsight by me.

Each comment is welcome.

Here i want to thank Luigi for giving me his pictures and Alejandro Tombolini who helped me in learning a little bit more about deconvolution (read here): Thank you guys!

Hi to all forum users.

I'm moving my first steps in deconvolution world with a few nice results.
But now I have problems in building a deringing support mask for a particular image.

I'm trying to deconvolve the linked M81 image (download from it's a small crop of the original image obtained with a Canon 5D camera: background corrected, white balanced and denoised with ATWT ).

I've built a PSF image using DynamicPSF tool but I'm not able to build a suitable star mask for Local deringing support:
I continue to have strong ringing artifacts around bright stars superposed to M81.

Could someone give me some advice or, better, process icons in order to achieve the best parameters to use in Starmask tool and in devonvolution?

Thank you in advance


Pages: 1 [2] 3