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Messages - oldwexi

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New Scripts and Modules / Re: Pattern subtraction scripts
« on: 2019 November 11 07:42:38 »
Alex, Walt,
We are ready.
We need only the permission of Vicent to give away the extendend scripts on an "as is" base.

New Scripts and Modules / Re: Pattern subtraction scripts
« on: 2019 November 10 12:26:32 »
Hi Vicent!
We have added to your script
LinearDefectDetection and
User Interfaces, so the Script does not need to be touched with Script Editor anymore.

We are asking for your permission to use your extended script in presentations at our next Austrian
PixInsight Meeting in April 2020. On an "as is" base.
It works on the active image or on images in a directory very nicely.

I have sent you with separate E-Mail the image of the UI for LPS.

Please let us know.

Gerald Wechselberger PI Austria

Bug Reports / Re: repository download HVB
« on: 2019 October 19 14:20:43 »
No, no bug.
The error maybe, as most of the time, is based between chair and keyboard.
Change in
       Manage Repositories
the repository adress to http:..... instead of https:.......


New Scripts and Modules / Re: FITS header output script ?????
« on: 2019 October 17 06:54:59 »
Have a look at the script FitsDataView from HvB

Downloadable from:


General / Re: Unable to Download Repository
« on: 2019 October 12 09:35:05 »
Ok in this case  if you want to access and download the HVB scripts directly i recommend:

If you want to update the repository of your installation you need to
in PI
    Manage Repositories

and here you enter or change the url to   without "s"


General / Re: Unable to Download Repository
« on: 2019 October 12 08:00:21 »
Look at:

A serach for HVB_Repository would also help ....
or simply remove one "s" ...


General / Re: DBE gives 'cannot close a dynamic target'
« on: 2019 September 29 13:35:08 »
Hi Gert!
To kill PI or pull the powerplug thats one methode.
The better methode is to click in the DBE Process Windows in the bottom on the
red cross. This closes your DBE process and your dynamic session.

But before you do that i recommend to drag and drop the triangle in the left bottom of DBE on an
empty place on your workspace. From here you can open it again, or save it to disk etc and have all the parameter again set as before.
By the way this works for nearly all processes.

Set the screenshot  delay in the Capture Screenshot to more than 1 second so you have time enough
to draw a rectangle. Keep the cursor untill the snapshot pops up.


General / Re: Bad black columns
« on: 2019 September 17 06:31:41 »
Hi Gerald
Thanks for your help.
I will try your method, but with 100 or more columns is this not so "amusing"  :surprised:
"Create for each darker columns....": Can PM this automatically, like a script?
I have the latest bias and darks of T32 and have shot 100 new bias.
Hi alphascorpi!
You are right with so many defect columns its a lot of work.

But, CosmeticCorrection needs also to find the column x position and to enter it into the dialog box.
Means, needs one Move with the ReadoutCursor to get the x value and entering the value into CC.
Using the PixelMath line creation you have to change also only the column value.
Execute it and save the image. after having created all line images i save the whole as project.
So when i get the next images to "decolumn" i load the project and have all the columns ready to adapt.

So,  there is not much difference in work but a lot in the result as CC destroys the real data in the columns
and PM plus mini stretch gets the real data correct!
All these mini stretches i save in a process container and run it against the image container of the new images.

Yes, i adapt the stretch parameter for each night separately. But thats not a great deal.

Usually this works.  I only use good data on iTelescope. You dont have to use bad data (haze, cloudy etc.)
you can reject them with iTelescope and get refund. So, with good data most of the time
the work done once helps also with the other ones.

My last final image consists of 108 raw images "corrected" the way i describe.
The image before, the SMC, consists out of 352 single raw images treated the same way.


P.S.: for these column troubles dither does not help (i dither every image), when you need to stretch the final
        image very much you will see these troubles if you use CC or nothing.

General / Re: Bad black columns
« on: 2019 September 16 13:27:53 »
For this issue CosmeticCorrection is not the right solution!
As it averages the bad column with the 2 neighbouring columns. This
will be visible in the final stack when you need to stretch a little stronger finally.

I had the same experience on T8 with these vertical "a very little darker" (not black) lines.
The difference in brightness to the neighbouring columns is around 0.01 to 0.001.

So my solution, which recovers(!) the original data is:
Create for each darker column with PixelMath a one pixel vertical line.
Use this line as mask and increase the brightness in one raw image carefully.
If you have covered all the lines in the one image you can process and correct all images
with imageContainer and Process Container.

Cosmetic correction should only be used when the column is near 0 = black or near 1 = white.

Solving the issue at the root -  try to get new darks and bias for this telecope. This could eliminate
painful corrections and create images without these artefacts.


General / Re: AnnotateImage Script: Add DWB catalog?
« on: 2019 August 31 12:01:00 »
the DWB catalogue is part of the SIMBAD Catalogue in Vizier.

You go on:
select   SIMBAD Objects  194
Change the output options to ASCII with "; separator"
Cut and paste the result in an editor for preprocessing and
later into Exel for final format creation for the custom catalogue.
Be careful the separators should be finally Tabs !!!
Also note that this catalogue does only provide object number and coordinates.
There is no Mag and Diameter information there.
I would paste simply Mag 10 and diameter 5 minutes in all columns.

Hope this helps

P.S.: I have the complete TExtfile here:
You only need to adapt it for the CustomCatalogue

Image Processing Challenges / Re: Non Linear PostProcessing
« on: 2019 August 20 14:12:27 »
Let me add that the change in the Bayermatrix postion happens in my opinion
in your capturing software,  which rotetes the image by 90 degress and therefore changes in the image the bayer mnatrix from
G .. G to
. GG .

P.S.: Just Checked the FITS Header of your image which clearly says:
Mirror in Y                   TRUE
QTURN 90 Degrees     TRUE

Setting both values from T like true to F like False should give you the bayermatrix
as mentioned by ZWO  !!!!

So dont rotate and mirror in the capturing software and everything will be fine and easy

Image Processing Challenges / Re: Non Linear PostProcessing
« on: 2019 August 20 13:47:34 »
Your image has excellent colors and is incredible sharp!
Find the link to your image annotated in full size.

The Bayer Matrix of your captured image resulted in GRBG  !!!
Using GRBG gives correct Star Colors.

To find out the correct bayer matrix of your image its very simple.
you have 4 possibilities. Those two with RGGB, BGGR  give checkers when you zoom in heavy.
So G cannot be inside the 4 letters. Whats left is either GRBG or GBRG. Doing an STF to these two immediately shows
the red nebula of NGC7000 by using GRBG.

By the way, if this is really a single exposure its a very excellent image!!!#


General / Re: PixelMath with ImageContainer
« on: 2019 July 27 13:39:57 »
Usually i use $T and do calculations with the actual image.

I have no idea how to access the last image for calculations with the actual image.
Will think about it but dont see a big chance.

Your request would need a little script which calls PixelMath with the formula and does the job
with actual image and previous image...

Sorry for havin no solution for your specific question.


General / Re: PixelMath with ImageContainer
« on: 2019 July 27 11:37:31 »
Hi Alejandro!
Put in the Image Container
the files which you want to use and
put the expression:
into "Output template:"
this writes your files to the selected output directory as:

Yes it creates allso these files as views in your workspace but a
"Close All" removes them all.

In PixelMath put your formula and simply  click "Create new image"
and set the Image id to:             image

This is how it works for me.


General / Re: MaskGen
« on: 2019 June 18 10:15:38 »
Thank You Hartmut for this excellent tool!

I think its the only one available which REALLY creates "STAR"masks.
Because you are using the GAIA Catalog for creationg the stars.
All other so called "starmasktools" i know only create starmasks out of bright pixels in the image, 
no matter if they are stars, small galaxies, asteroids, hot pixels etc....

And ther possibility of creating/selecting  a starmask based on original star Magnitude is also a great help!

So, when creating a starmask -  if i want to keep the tiny galaxies and other nonstar objects i use your tool!

Again a great work.

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