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Topics - dougggg

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With HA layer applied to Red channel. Takahashi FSQ106 106mm. Siding Springs Observatory.
I think PhotometricColorCalibration is much easier to use than ColorCalibration and at least for me produces more consistent results. Higher resolution at

PCL and PJSR Development / PSJR move ImageWindow
« on: 2017 August 10 14:02:32 »
I've tried but no success. How can an ImageWindow object be moved at a specific location on the PixInsight desktop?


Bug Reports / Console hangs with !cmd -c
« on: 2017 June 21 04:09:47 »
I’m running Window 7 Home Premium. I realize the correct console command is:

  !cmd /c dir

But PixInsight Core Ripley (x64) hangs when I accidentally execute the following command from the console command line:

  !cmd –c dir

Gallery / M12 PixInsight / ESO Archives
« on: 2017 June 16 04:02:28 »
We all like collecting our own data but there is a wealth of high quality archive data online, not just Hubble. M12 using PixInsight and archived data ( from the European Southern Observatory 2.2m Cassegrain and its Wide Field Imager. Resolution 0.238 arcsec/pixel. Exposure 20 seconds each.

ESO archive FITS files:
  • I = WFI.1999-05-14T06:19:57.132
  • V = WFI.1999-05-14T06:28:10.891
  • B = WFI.1999-05-14T05:53:13.186

ESO archive query parameters:
  • Target Name: M12
  • Imaging: WFI
  • Category: Science
  • Mode: Image
  • Exptime: < 20

Tutorials and Processing Examples / Creating a circular mask
« on: 2017 January 27 13:57:47 »
Sometimes when applying an operation to the nucleus of a galaxy it is useful to have a circular mask that is strong at the center and gradually blending into the background near its edge. The mask can be created with PixelMath with the equation:

iif (sqrt((x()-XCenter)^2 + (y()-YCenter)^2) < Radius, (Radius - sqrt((x()-XCenter)^2 + (y()-YCenter)^2))/Radius,0)

where Radius, XCenter and YCenter are defined as symbol values with (XCenter, YCenter) as the location of the center of circular mask.

The attached image shows the mask created.

Bug Reports / CosmeticCorrection Use Defect List bug
« on: 2016 December 11 10:48:16 »
There is a subtle bug in the CosmeticCorrection Use Defect List option. When correcting a column or row, the implementation calculates the replacement value for a pixel to be the median value of the 24 pixels in the nearest 5x5 square excluding the pixel being corrected. When correcting a pixel in a column, the two pixels directly above and below in are included in the median calculation but they should not be since in a bad column these pixels are bad data. Similarly, when correcting a row the two pixels to the left and right are included in the median calculation. I have test data to confirm.

Gallery / M74, 36 minutes, 17" Planewave reflector
« on: 2016 November 25 17:38:35 »
Looking for constructive criticism on the attached image. I've also attached the PixInsight process history file. Too much contrast? Not enough noise reduction? Something doesn't look right.

Did the normal pre-processing with devolution prior to the stretch. No pre-stretch noise reduction.


On the DynamicCrop dialog window the clamping threshold defaults to 0.30. However, when the javascript code button is clicked, the code dialog box shows P.clampingThreshold = 0.00;

PCL and PJSR Development / PSJR: StarMask Image Identifier
« on: 2016 October 09 11:08:07 »
After running the StarMask Module from PSJR, is there any way to determine the Image Identifier of the image star mask creates?


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