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Topics - pscammp

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General / Blink Problem !
« on: 2018 February 10 04:39:23 »
Hello all,
    When I use Blink and load all the images from 'X' folder for viewing it defaults to using a STF with linked colour channels, I click the button to unlink
the channels and then I can view the images without the red colour bias my Camera produces (non calibrated Lights used here).

When I step through the images one by one they get darker and darker until it looks like no STF is applied at all. As soon as it comes back to image one
I get full STF again only for the images to darken again as I step through them.

It does this with all the sets of lights I have got so it's not just a particular set of lights being affected.

If I click the button in Blink to apply an actual stretch rather than the STF then all the images look the same brightness as I step through them.

Does anyone know what is happening here, does anyone get the same issue  ????

Many Thanks

General / image integration Question !
« on: 2018 January 28 09:11:57 »
Hello All,
    I have a question regarding Image integration if you don't mind......

When doing the final integration I use Linear Fit Clipping and I also use a preview to play with the High and Low sigma sliders to get the best noise result I can.

The question I have is not so much to do with the final integration but more to do with integrating the Biases and Darks etc.

Based on this tutorial:

The tutorial suggests using Winsorized Sigma Clipping for the darks and biases, is there any real benefit from also playing with the high and low sliders using a
preview to get the lowest noise in these calibration files, or just let it run at default values   ????

Many Thanks People

« on: 2017 December 24 15:30:55 »
Hello all,

I'm in the UK and I just want to wish the whole PI community a.....


Wooooooo Hoooooooo

Many Regards

Hello all,
    I was looking at a few images I have processed over time on my calibrated monitor today (not brilliant I might add - LOLOLOL - The Learning Curve !)

Anyway, what I noticed was that the backgrounds between them were all at a different brightness, although not by much it was still quite noticeable.

What I am wondering is how people go about finally setting the background brightness at the end of their processing so next time they process
a set of data they would do the same thing to that image too.

I would like to send my completed images to a printer so I can hang copies on the wall in one of my rooms, Wife's idea not mine   LOLOL  Bit like an inspiration
wall so to speak. It's going to be a bit weird if 2 images are next to each other and the star field of one is much darker than the star field of the other  !!!

So tell me peep's, what is the best way to establish a certain star field brightness for one image and to be able to reproduce the same on the next image I process.

Many Thanks

General / New images created !
« on: 2017 December 01 16:23:00 »
Hello all, hope skies are clear for you,

I have just got a new monitor which has a resolution of 1920 x 1200 which gives me way more screen real estate than my previous one which was (cant remember now, how MAD is that !) way smaller anyway.    :surprised:

So now when I have an image up on the interface, a comfortable size for me is 1:3 with 'fit view' applied.

If I use DBE for example, when PI produces the resulting image, it creates the result (and the map of what it has subtracted) at 1:1 which almost fills the whole monitor, some of which is behind the modules, like the DBE module, which I am using which I really hate with a vengeance    :o

Now I know with PI, there must be something I'm missing here in Preferences - What I would like is that any image created by a process be created at the same zoom value as the image I have just applied it to  !!!!!

Is there any way to constrain PI to do this   ????

Many Thanks

General / Pesky Reflections !
« on: 2017 October 04 08:51:46 »
Hello all,

Hoping someone may be able to help me out here !

Attached is a zoomed in portion of a final integration of M42, as you'll see I have suffered from a nasty reflection from my mirror caused by the very bright star which is just below M42. The reflection is showing as green almost in the center of the attached image and is really annoying.

The attached image has the STF applied with 'Link' turned off

Is there any possible way of removing this reflection or am I stuck with it   ???

Many Thanks for any help


General / Photometric colour calibration tooooo Blue
« on: 2017 September 19 07:38:42 »
Photometric colour calibration = Very Blue image !

Any of you guy's know what might cause this   ??

M42 integration

Image look very blue after the process, using the Readout Mode tool shows that the reds are really close to zero
but the blue & green channels look more normal.

Just curious at this time


General / LocalNormalization Error
« on: 2017 September 16 07:38:18 »
Hello all,

I have just attempted to use the new LocalNormalization tool while following the following tutorial:

I ran the tool and it was a complete success according to the process console, I put the destination folder to the same as the 'registered' files as suggested in the tutorial.

When attempting to do the final Lights integration, I Add the registered lights, click the 'Add L.Norm Files' button, select the normalization files and click Open

at this point I am presented with the following box, anyone know what this means cos it never loaded the normalization files from what I can see:


General / Batch Bebayering .xisf Lights
« on: 2017 August 24 02:50:20 »
Hello all,
    I have the new version of Pixinsight installed. I have just been going through a Preprocessing workflow with my Colour subs, got to the stage of debaying my lights and opened the Batch Debayer script and it does not seem to accept .xisf files only .Fits

Anyone know how I can batch debayer my .xisf lights  ????

Many Thanks for any help


General / Slightly Off Topic as Xmas is upon us ! ! !
« on: 2016 December 23 09:23:24 »
Hello All,

I just wanted to say a very merry Xmas to all the team who give us such a fantastic tool and who continue
to slug their hearts out to make it better.

Bless all of you and to all of your customers too

Seasons greetings
Paul UK

General / Linear Fit Clipping ! ! !
« on: 2016 December 02 06:40:45 »
Hello all,

Just wondering if I may ask a question ref Linear Fit Clipping ?

I used Linear Fit clipping in the Image Integration module due to the amount of sub's I had after reading
documentation etc.

When the final Integration is done after all the calibration routines I end up with my master Light, a Low
rejection image, High rejection image and a Slope Map.

What on earth is a slope Map, what does it show, and how do you interpret what is shown in it, and, how
can you tell you have a Good Slope Map or a Bad one  ?

Attached is a jpg image of my Slope Map just for visual reference.

The image is of the IC63 area. The green blob just left of center is a reflection in the image caused by the
very bright star to the right. The Grim Reaper himself would appear immediately to the right of the green

Thanks for any (Pix)insight


General / More FLATS !
« on: 2016 July 14 12:23:29 »
Hello again,

More FLATS !

Ok, take a look at the attached image of a single Flat which has not been De-Bayered

This is a sub 1 second Flat exposure using a QHY8L at around 0.3 sec's

General / FLATS !
« on: 2016 July 14 12:15:02 »
Hey Guy's & Gals,

I have a question about Flats if you don't mind......

Lets say I have x30 Flats taken using Sequence Generator Pro at 30,000 ADU......

Now lets say I wish I had Taken them at 22,000 ADU......

Now lets say I couldn't be bothered to get all my kit out & set it up again......

Is it possible in Pixinsight to 'Accurately' convert 30,000 ADU Flats into 22,000 ADU Flats

? ? ? ?

Many Regards

General / QHY8L FLATS - Problems in BPP
« on: 2016 March 12 09:13:03 »
Hello all,
   Just given my 'second hand' QHY8L first light. Due to a rather annoying hardware issue I only managed to get x10 Lights each at 180 sec of the M81 / 82 pair.

Got x10 DARKS and x10 Bias calibration frames the next morning along with x10 FLATS but after running it all through BPP I ended up with an image with very light edges, seem this appears to be a common problem as I read across the Net but still cant seem to find a definitive answer to the problem.

I will attach a Gimp produced .jpg image of how my final integrated Light looks in Pixinsight with STF applied (unlinked) as the file seems to be a massive 210Mb in size (  :o  What the hell's that all about  ???? ) so I cant really do anything with it, Dropbox complained !

I done my FLATS in the usual way using Sequence Generator Pro's FLAT's wizard using an EL panel which gave me exposure lengths of way less than 1 Sec and they over brightened the edges of the frame. After reading and reading on the net some were saying with a QHY8L, FLATS need to have an exposure time of over 4 sec's due to the dual readout issue. So with multiple pieces of white paper I kept adding these until I got above the 4 sec mark - Still bright edges !

More reading told me that my ADU of 25000 may be way too much so then I took a library of FLATS which had ADU's ranging from 10000 to 30000 with x10 exposures in each folder. The FLAT exposure times ranged from 4.1 sec all the way up to 19.6 sec so I could try different sets to find the 'sweet spot' for my camera.

The Over-illumination seen in the attached pic looks identical using the 10000 ADU flats AND the 30000 ADU flats and everything in between - Im confused to hell, my Canon 1000D used to produce perfect FLAT correction every time in Pixinsight  ??????

I have a master bias, dark and flat which was used to calibrate the x10 lights in the attached image in case anyone wants me to load them up for inspection, these are all 23Mb in size so if anyone wants me to load them up, just ask.

In spite of the over illumination problem and the fact that I was a little out of focus on the Lights, for only x10 Lights, im quite chuffed with the resulting image for a very inexperienced Astro photographer, a reasonable amount of detail in there I thought ?

One thing to note about the flats library, they were all done with the camera at zero degree's but the Lights were actually at approx. 99.1 degree's ref SGP's Framing & Mossaic wizard, not sure if this makes much difference but dust bunnies seemed to be in the same place on Lights and Flats.

So the questions:

1. Will the fact that I used Flats at zero degree's when light were at 99.1 cause what is seen in my image as the illumination is not only the corners  ?

2. There appears to be differing opinions on the net - Should I make sure Flats are exposing above 4 sec when using a QHY8L ?

3. With a library of Flats ranging from 1000 ADU all the way to 30000 ADU - How can the BPP result look identical in all of them ?

4. HELP !

Ow please, someone help me here, this is driving me to drink !

Many thanks for anyone who can help me get sorted.



General / BatchPreprocessor issue
« on: 2016 March 07 10:22:49 »
Hello all,

Latest Pixinsight release installed......

I need someone's help here, have not used Pixinsight for quite a while due to other commitments. The other night
I managed to get out under the stars and have a go at M81 / 82. I lost some lights due to a problem but I still managed
to get some Lights, Darks, Bias and Flats with my QHY8L.

Chucked it all into the BatchPreprocessor like I always used to but it does not seem to give me a final image which I swear
used to be in the Masters folder.

This is what it's giving me:

Output Directory I chose was 'C:\Try 1':

In the main 'Try 1' folder I get the following 2 folders:   'Calibrated' and 'Master'

in 'Calibrated' I get 2 folders -> 'Flat' and 'Light'

In 'Flat' I have all 10 flats with the 'c' suffix for calibrated

In 'Light' I have all my Lights with the 'c' suffix and a subfolder called 'Debayered' with all my Lights with 'c_d' suffix for calibrated and Debayered I assume

In Try 1's subfolder -> Master I get a Master Bias, a Master Flat and a Master Dark


I swear blind I always used to have a Master Light in there too which was my final completed image ???

Where could it be ?

Any help would be appreciated



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