Mike Cranfield

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• I believe the word "screen", used to describe the screen blending mode, comes from the analogy of projecting photographic slides onto a screen. The screen blend of two images is broadly similar to the effect of projecting the two images onto the sam…

  in Screen vs. Unscreen Stars Comment by Mike Cranfield November 2023
• The Panasonic sensor used in the ASI1600MM is know for this effect. If you want chapter and verse check out this thread on CloudyNights.

  in Faint pattern around bright stars Comment by Mike Cranfield November 2023
• Actually there are differences.  Adding and removing stars is usually best done at the linear stage but this is not always practical given the required workflow. The ScreenStars script gives the option to work on pseudo linear images by applying a r…

  in Screen Stars Script Comment by Mike Cranfield November 2023
• Hi Gary Just to pick up on the BXT/luminance mask issue. If you think what BXT is doing, it is taking the PSF of your star images and applying a deconvolution algorithm to adjust back towards a more "ideal" form. This involves adjustment across the …

  in Narrowband Color Mapper Script Comment by Mike Cranfield October 2023
• Your paint over method on the stars image will work fine but when you are done you will need to "unscreen" the stars from the original image using PixelMath as follows: rescale(original, stars, 1). (This is assuming you are working on non-linear dat…

  in Removing StarXT artefacts Comment by Mike Cranfield October 2023
• Hi Gary Thanks for taking the time to provide this helpful feedback. I'm sure Adam will have some comments but I will pitch in with a few observations. To address your questions by number: 1) I can't reproduce the double click required on "Update" -…

  in Narrowband Color Mapper Script Comment by Mike Cranfield October 2023
• No - should work fine!

  in Narrowband Color Mapper Script Comment by Mike Cranfield September 2023
• Are you reluctant to upgrade to 1.8.9-2 for some reason? If so, all I can suggest is that you find the updates.xri file in your PixInsight directory and delete/move this - then restart PixInsight. This will force a full download of all updates inclu…

  in Narrowband Color Mapper Script Comment by Mike Cranfield September 2023
• I can see no reason why a PI crash would be related to this script. The signature file should not be an issue - not least because 1.8.9-1 supports these anyway. I think there is something unrelated to NBCM going on. I would suggest upgrading to 1.8.…

  in Narrowband Color Mapper Script Comment by Mike Cranfield September 2023
• Maybe we are talking at cross purposes. In that video Paulyman is working in narrowband Hubble palette. Colour precision is not an issue in that case.  I was taking my cue from the title of this thread and assuming an LRGB image. My point is that, i…

  in Best stretching method prior to LRGB combination Comment by Mike Cranfield June 2023
• I am not sure I agree with the implication that subtracting an additive pedestal does not change the colour balance.  The "Colour" is determined by the ratio of R:G:B.  If you subtract an additive pedestal, p, say the ratio (R-p):(G-p):(B-p) is not …

  in Best stretching method prior to LRGB combination Comment by Mike Cranfield June 2023
• I have just released an update that now allows you to specify a circle at the end of your arrow.  Enjoy!CS, Mike

  in Adding an arrow in my image of M101 Supernova Comment by Mike Cranfield June 2023
• I have created a script that makes this easier - follow this link to the PixInsight forum for more details.  The repository to download the script is: https://www.cosmicphotons.com/pi-scripts/drawannotation/

  in Adding an arrow in my image of M101 Supernova Comment by Mike Cranfield May 2023
• I'm glad it worked for you! :)

  in Adding an arrow in my image of M101 Supernova Comment by Mike Cranfield May 2023
• A slight update to my last comment In red: aL = arrowLength/width();aW = arrowWidth/height();aH = arrowHead/width();cX = centreX/width();cY = centreY/height(); r = rdist(centreX, centreY);a = pangle(centreX, centreY); a = a + rotateAngle * pi() / 18…

  in Adding an arrow in my image of M101 Supernova Comment by Mike Cranfield May 2023
• If you are happy with a horizontal arrow you can set up PixelMath as follows: Copy the following into the red tab: aL = arrowLength/width(); aW = arrowWidth/height(); aH = arrowHead/width(); cX = centreX/width(); cY = centreY/height(); inShaft = i…

  in Adding an arrow in my image of M101 Supernova Comment by Mike Cranfield May 2023
• I agree that human behaviour provides a powerful rationale to do something else. I will give some more thought to the best approach. Thanks for your feedback. CS, Mike

  in GHS videos Comment by Mike Cranfield April 2023
• Hi Adam An interesting question! Let me explain the logic behind the current approach. GHS is intended to conform with the fundamental object oriented design philosophy of PixInsight.  So the GHS interface is first and foremost designed to define a …

  in GHS videos Comment by Mike Cranfield April 2023
• The signature is located in the ColorMask.xsgn file in the same directory as the ColorMask.js file you are editing. Because you have changed the ColorMask.js file the existing signature is no longer valid. The simple workaround is simply to delete (…

  in Adam Block ColorMask fix on Mac Comment by Mike Cranfield September 2022