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Messages - gnomus

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1
Announcements / Re: PixInsight 1.8.8-4 Released
« on: 2020 January 21 03:28:49 »
I've just installed this update.  I now get an error every time I launch PI.  It relates to the PI Update System and it tells me that it is 'Unable to download repository information'.   Expanding the little box, tells me that I have an "Invalid platform 'version' attribute value '1.8.8:11.8.8-2'..." 

Edit:  I should add that I am using Win 10 HE on a Desktop/Monitor.  No previous issues.  Whe I downloaded the update it was extremely slow - indeed dial up speeds.

Please advise.

2
Silly question time.  Do you apply the Pixel Match formula to the whole image or to one that has been star-masked?

3
General / Re: Process Explorer Interface
« on: 2017 September 02 11:52:10 »
Thank you.  That has worked a treat.

4
General / Process Explorer Interface
« on: 2017 September 02 01:56:33 »
My 'Process Explorer' used to pop out from the right hand side of my screen with all of my 'Favourites' expanded and ready to go.  Since one of the recent updates, I now get 'Recently Used' and 'Most Used' expanded and 'Favourites' non-expanded.  I preferred it the old way.  Is there any way of getting that back?

5
For future PCC users, I strongly recommend using the SDSS-DR9 data instead of the APASS whenever possible. The SDSS data are acquired with a 2.5m telescope and the APASS data with a 3.15cm.  Also, the SDSS folks are more experienced. Additionally, the APASS staff have freely admitted that some of their data are problematic.

I recently encountered a Southern Hemisphere field-of-view where the APASS data had obviously highly inaccurate (b-v) values. Also, the Sloan g' and r' filters produced poor RGB color correction. In the Northern Hemisphere, the APASS data have always agreed with the Sloan for color correction.

BTW Juan, will the PCC user interface return the RGB values used for the pixel math? I would like to compare with my results. I have no doubt that the PI routines are more sophisticated than eXcalibrator's white-star and linear regression.  Also, with direct access to plate solving, the PI process will be easier to use.

But will the results provide a significant difference in the final color? It can take a surprisingly large change in RGB factors to be noticeable in the final image.

Like I said earlier, I am a PixInsight user and find the program exceptional and powerful. I'm looking forward to taking PCC for a spin.

Regards,
Bob

Sorry to be a bit slow.  How does one acquire the SDSS data and 'enable' it in PI?  In my installation the only Photometry catalogue available in the drop down menu is APASS.

6
OK.  That was definitely the issue.  I chose 'Bicubic B-Spline' (which has a fixed clamping threshold of 0.1).  Problem has gone. 

Thanks for your help.

Steve

7
OK.  Thanks.  I'll try some different settings.  Any starting suggestions?

8
I am imaging at 3.2" per pixel resolution (a Williams Optics Star 71 and a Moravian G2-8300 camera).  I have no issues as far as I can see with tracking/guiding.  My individual stacks are good.  However, when I combine RGB I often get litle black 'blocks' at the edges of stars.  Only certain size stars seem affected.  I've shown these to some folks.  Someone thought it might be aliasing.  I also remember somebody once saying something about 'clamping' but for the life of me I cannot find any reference to that.  In any event, any thoughts on how to eliminate this issue?


9
This is a great script.  Thank you.  A friend suggested some settings for my KAF8300 chip, and these work well.  I now have a QSI 690.  Could anyone recommend some starting settings for that camera?

10
General / Re: Everything Is Very Red!
« on: 2015 February 27 23:42:01 »
Thanks everyone.  I will try the various suggestions.  Once I did Colour Calibration, Image 1 looked like Image 2, so that was the issue.

11
General / Re: Everything Is Very Red!
« on: 2015 February 27 00:15:50 »
OK.  I've been following the recommendation to use Background Neutralisation as a first step, but I am not sure that I am getting the desired result.  I have attached two photographs.  The first is what I achieve just doing a Background Neutralisation on my stacked image file, then a quick Histogram Transformation using the settings given in Screen Transfer Function (linked).  The second image shows what I achieve by splitting the RGB channels, then Linear Fit, then LRGB Combination and finally a Histogram Stretch using the STF linked settings.  As can be seen the BN version is still quite reddy-brown.  The Linear Fit seems to give me a better starting point.  It would be nice to know what I am doing wrong so that I can get a more efficient workflow.

Thanks for your continued interest.

12
General / Re: Everything Is Very Red!
« on: 2015 February 25 10:25:00 »
One thing I have noticed is that when I hover the mouse over a menu item a potentially useful help text box appears.  However, usually this text is cut off a certain way into the dialogue.  Is there any way to force PI to show the entirety of what is in the help box?

I get the same thing every time. The simple solution is to mouse over another menu item and then quickly mouse over back to original menu item. It takes some practice but should work. A little inconvenient. It's been like that since day one on several of my computers.

Peter

OK, I understand - it's a 'feature'.   >:D

13
General / Re: Everything Is Very Red!
« on: 2015 February 25 09:20:14 »
Thank you.  I'll have a play.

One thing I have noticed is that when I hover the mouse over a menu item a potentially useful help text box appears.  However, usually this text is cut off a certain way into the dialogue.  Is there any way to force PI to show the entirety of what is in the help box?

14
General / Everything Is Very Red!
« on: 2015 February 25 08:13:55 »
I have recently purchased my PixInsight licence.  I'm pleased with the program, but I don't know if I have it set up correctly.  I use an astro-modded Canon EOS 600D.  When I load my stacked images into PixInsight and use the Screen Transfer Function everything is very red (and I mean very red).   I can get rid of this with DBE, but have found that the best way is to split the image into R, G & B channels, then use Linear Fit and then LRGB combination.  It seems odd that I should have to do this.  And it does of course add time to the processing.  I am becoming increasingly convinced that I have something set incorrectly.

I have attached a reduced version of an image to show what I mean.

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