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Messages - dld

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General / Re: What does RGB working space actually do?
« on: 2019 October 25 08:52:00 »
Thanks Steve for asking this since I have a similar question:

Some people suggest setting the RGBWorkingSpace coefficients at equal values. Is this necessary? And if yes, when and why?

Clear skies,

Bug Reports / Re: Catalog Star Generator problem
« on: 2019 October 13 09:45:42 »
Hello Guillaume,

An easier way to do mosaics, without the need of an artificial star field, is by using the MosaicByCoordinates script. Platesolve each panel and use the script to register all the panels together. And then use the GradientMergeMosaic process for the seamless assembly of the registered panels.

Bug Reports / Re: Problem decoding Canon 60D RAW
« on: 2019 September 26 12:51:47 »
The file appears to be an mRAW file.

An older PI version reports the following:

Timestamp: Mon Sep 23 21:17:23 2019
Camera: Canon EOS 60D
ISO speed: 800
Shutter: 120.0 sec
Aperture: f/inf
Focal length: 50.0 mm
Embedded ICC profile: no
Number of raw images: 1
Thumb size:  5184 x 3456
Full size:   3888 x 2592
Image size:  3888 x 2592
Output size: 3888 x 2592
Raw colors: 3
Daylight multipliers: 2.280493 0.939530 1.270003
Camera multipliers: 2072.000000 1024.000000 1662.000000 1024.000000

Invoking: dcraw -4 -o 0 -r 1 1 1 1 -t 0 -k 0 -H 1
Decoding Canon EOS 60D file (3888x2592 pixels, ISO=800, Exposure=120.00s): done
Loading raw image: done

I can't debayer the image. Maybe the inconsistency between image size/thumb reported size causes the problems.

Consider using the full-size RAW file format while imaging.

Bug Reports / Re: PI Installation problem on Windows 7 and 8
« on: 2019 September 21 00:47:41 »
Excusez-moi, je ne parle pas fran├žais :sad:. Fin du support officielle pour Microsoft 7 et 8.1: 13 Janvier 2015 et 9 Janvier 2018:

So this is inevitable. If you still have a decent PC and you don't want to install Windows 10, consider Linux as an alternative OS.

General / Re: Masked stretch and big star appearance
« on: 2019 September 18 04:39:36 »

The tooltip over the Iterations setting of MaskedStrech suggests increasing the default number (100) of iterations in such cases. Does this work for you?

There is a slight chance that StarAlignment mistakenly picked hot pixels as stars. In that case the real stars will either average out or rejected by ImageIntegration. Use Blink to inspect your registered frames to see if you have badly aligned frames in your stack.

General / Re: Quantification of image noise, literature
« on: 2019 September 06 10:25:14 »

PixInsight developers usually refer at articles by Jean-Luc Starck (who's known for work on wavelets and sparsity). Richard Berry's "Handbook of Astronomical Image Processing" is another reference used by PI developers, but I might be wrong. Anyway, most of the articles at have "proper" references so maybe it's the best place to take a look for something relevant to your needs.

Image Processing Challenges / Re: Non Linear PostProcessing
« on: 2019 August 21 13:27:16 »
You are welcome Marc,

Imagine an empty chessboard and yourself ready for a chess game. At the top left corner you see a white square and right next to it a black. If you rotate the chessboard by 90 degrees, the top left square is now a white. In chess there is the convention (rule) that the board is placed so that a white square is in each player's near-right corner. Unfortunately we haven't any rule for the placement of the contents of a Bayer matrix into a file, and furthermore, we have three colors instead of two!

That's why it is important for the software reading such files to know where to start reading pixel values and what color to assign at each pixel.

Any kind of luck is welcome :D even beginner's luck! I am sure you'll obtain fine images with your gear! I wish you more luck and clear skies!


Image Processing Challenges / Re: Non Linear PostProcessing
« on: 2019 August 20 14:16:28 »
I agree with Gerald, GRBG seems to be the correct pattern. And yes the image is sharp, the camera seems fine, and I am jealous :laugh:. These discrepancies are due to how the various acquisition programs decide to arrange the pixel values into an array of numbers and then into a (FITS) file. 

PS: Take a good read at Rob's post at Cloudy Nights. I think Bernd has some nice posts somewhere in our forum explaining what's going on, but I can't find them at the moment.

Image Processing Challenges / Re: Non Linear PostProcessing
« on: 2019 August 20 02:51:25 »
for dld, i have added one of my raw shot on iCloud. Debayered and STF boosted autostreched it gives an image that turns red/violet. So from my understanding, it seems that my CCD has not captured many colors? thx
Hello mhambuch,

I will be glad to take a look at your raw files but unfortunately I can't find them. Maybe the iCloud sharing link needs to be updated? Chances are the Bayer pattern you are using during debayering is not appropriate for your sensor. Your camera is probably fine!

Image Processing Challenges / Re: Non Linear PostProcessing
« on: 2019 August 14 00:19:56 »

A checkerboard pattern is visible in the dark areas of the image, when extremely zoomed. My suspicion is that something went wrong during calibration. Also the red channel is nearly the same as the blue channel.  How does the uncalibrated lights looks like? Do they have the expected colors?

Image Processing Challenges / Re: m106
« on: 2019 August 08 02:46:02 »

The CanonBandingReduction Script with the default settings and the "Protect from Highlights" tick box enabled, seems to fix the issue well. If you have similar issues regularly you may need to revise your calibration workflow as Bernd suggested earlier.

If I remember, the Fireworks Galaxy is bright in infrared. Thus the PCC result might be more reasonable. This is one of the advantages of PCC over using the whole galaxy as white reference.

General / Re: DSLR - Cosmetic Correction and Dithering
« on: 2019 July 30 23:42:05 »
Hello, I have the 6D too and I don't do cosmetic correction. Dithering deals well with any hot/cold/stuck pixels and helps a lot with fixed-pattern noise.

(edited after Andres' comment)

You may take a look at the benchmark results users have submitted so far

However, details on swap files configuration aren't always available.

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