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Messages - wvanreeven

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Wish List / Re: Make select all work on macOS
« on: 2019 August 27 00:49:35 »
Bump. Can any of the developers of PixInsight please comment on my request? Many thanks in advance.

Cheers, Wouter

General / Re: Would you upgrade my PC?
« on: 2019 August 18 02:18:42 »
What would you do in this situation? spending around 1-2 hours on stacking is simply very frustrating.

How many lights are you stacking? And when you say stacking, do you mean running the image integration process only or do you mean the whole process from creating a master bias up to having an integrated image?


Great, thanks for the quick confirmation!

Image Processing Challenges / Re: m106
« on: 2019 August 08 04:50:26 »
Another way to prevent Canon banding is to use dithering during imaging. Unfortunately that will not fix the issue with the image that you posted.

HTH, Wouter

General / Re: drag and drop?
« on: 2019 August 08 00:15:05 »
I just tried on my MacBook with a randomly selected JPG image and it got opened in PixInsight without any problems. What OS are you on and what version of PI do you use?


Thanks very much for this. Does this all also work with a trackpad on a MacBook?

You can eliminate the need to crop each image individually by doing the crop before the StarAlignment and then use that File or View as reference. This will crop the rest of the images while doing the star alignment.

HTH, Wouter

General / Re: PixInsight Error Combining Two Sets of Data
« on: 2019 August 05 14:34:30 »
Is dithering involved in any (or both) of the images? That would make a difference of a factor 2 which should be taken into account.

HTH, Wouter

PCC uses the star colours as seen from Earth so it shows things as we should see it from Earth. Whether or not you like it is up to you  :)

Astrophysically speaking the catalog *does* compensate for dust because the stars are affected by dust as well though mostly less than the galaxy since most of the dust lies behind the stars. This is why the galaxy appears as red. It is counter-intuitive though since “compensating for dust” implies “removal of the effect” while that is not the case in this case. Anyway, that’s all semantics of course  ;)

General / Re: The problem of green in narrowband SHO palette
« on: 2019 August 05 04:54:34 »
Correct me if I am wrong, but the SHO Hubble palette maps S to red, Ha to green and OIII to blue right? That's how the green ends up in the image. Since Ha usually is the strongest component of the three, these kind of images tend to have a green hue that can be removed in various ways with SCNR being one of them.

HTH, Wouter

General / Re: Unable to remove directory: Permission denied
« on: 2019 August 03 06:18:31 »
Hmm I just saw that I have installed PixInsight on my Mac with root permissions and I cannupdate it just fine. Sorry, no idea what may be going on.

General / Re: Unable to remove directory: Permission denied
« on: 2019 August 02 04:39:08 »

It looks like you are on MacOS, is that correct? If yes I think you installed PixInsight with root permissions. Can you confirm?

Clear skies, Wouter

Hi and welcome to the forum,

Relax, this is normal! The images are colour images and PixInsight needs a little help decoding the colour. Basically, the images is built up or red, green and blue pixels and PixInsight needs to know which pixel represents which colour. The order in which the pixels are building up the image is called the Bayer Matrix and you need to Debayer the image in order to see the colour. See for more info

and search for debayer in that page.

Clear skies, Wouter

Off-topic / Re: To be a better astro-imager ....
« on: 2019 July 25 07:28:58 »
Please note that I am far from an expert but here are my $0.02:

1. That really depends on a lot of things like whether the weather is expected to stay stable over some time and how patient I am. I guess it is a personal choice and it really also very much depends on what you want to achieve (really deep image, mosaic, a quick series of not-very-deep images etc etc). I am sure more arguments for the one or the other can be found. Perhaps you can try to explain what it is that you are trying to achieve?
2. I usually don't go beyond level 4. Concerning the corners: I made sure that the back focus between the flattener and the sensor is correct so I usually only check for guiding issues.

HTH, Wouter

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