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INDI Library v2.0.6 is Released (02 Feb 2024)

Bi-monthly release with minor bug fixes and improvements

How do you work with fits files under linux

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I use Siril and Astro Pixel Processor depending on what I am doing.
5 years 5 months ago #30577

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Thanks for the quick replies, I'll try these. Wanted something for a quick screening. I intend to get to PixInsight but it looks like a steep learning curve for a first timer, so I was thinking of doing that during snow season.
Thanks again
Tom
5 years 5 months ago #30580

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I started with Pix Insight about 1,5 year ago and now am looking into Astro Pixel Processor as well. It is much more user friendly than PI, cheaper and at least as good for stacking. PI does offer a LOT more though in terms of post processing.
Last edit: 5 years 5 months ago by Wouter van Reeven.
5 years 5 months ago #30582

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I use Gimp 2.10, my workflow is like this,
Open the .fits images as layers,
Stretch images with "Colors" -> "Levels..." and then use the "Input levels" sliders as much as you need,
Then if your images doesn't match you can use one image as a reference and mark other layers as "Difference" and then move the layer as close as you can,
After that select "Screen" for all layers except the reference layer to stack them all..
That's all.. :)
It's also possible to create a color image if you use a filterwheel, it's a bit more complicated but I'm pretty used to that and if you like I can post a workflow.
But I think Siril is a better choice because Gimp can't do a subpixel move on layers..
5 years 5 months ago #30585

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I would be interested in your workflow.
5 years 5 months ago #30587

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So here is my workflow using Gimp,

Open all images you need (RGB) as layers,
When images are loaded select "Image" -> "Mode" -> "RGB" from File menu,
Colorize the layers with corresponding color, mark the Red layer and select "Color" -> "Colorize" -> "Red"
You can do a persistent color scheme to fit your needs.
Then select the green image and do the same, and the same with the blue image.

Now make a copy of the green image, select the green image, press Ctrl+a -> Ctrl+c and the paste (Ctrl+v) over the red image, that creates a new layer you can name to Green.
Then make a copy of the blue image and paste to the newly named Green image, that will also create a new layer you can name Blue.

Now you should have 2 more layers called "Green" "Blue" and the original "Red" image..

Then change the modes of the "Green" and "Blue" (copied) images to "Screen", that will blend the colors so you get a RGB image.

After that move the layers one by one if needed to match the stars.. and as the last step create a new image of visible layers and do some stretching to "dig the objects out"..

Hmmm.. I hope I didn't forgot anything but to be sure I can make a video and put it on youtube.. :) I'll let you know.

Br
/Markku
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5 years 5 months ago #30599

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To have a peek at a .fit image you can use Kubuntu's default image viewer (Gwenview).

There is a free software solution called Regim that performs calibration, deblooming (if necessary), normalization and combination (stacking) all in one go. It can also perform batch conversion of images and an automatic or (if preferred) manual color correction. www.andreasroerig.de/regim/regim.xhtml

Gimp 2.10 can handle 16bit images and will do all sorts of image manipulation.
Last edit: 5 years 5 months ago by Alfred.
5 years 5 months ago #30603

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For just viewing I can recommend SAOImage DS9 . It supports various scaling options (linear, log, sinh) scroll zoom, value display and even more sophisticated stuff like WCS.
The real processing I do mostly in IDL (similar to IRAF/Midas), and GIMP for the final retouching and color balance stuff in LAB colorspace.
5 years 5 months ago #30656

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Now you can find my (bad) educational Gimp video here :
The following user(s) said Thank You: Thomas Seckler, Gonzothegreat, Hellriegel, Jim, Brian
5 years 5 months ago #30728

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Hi. Siril. Stacking and processing.
We made a video:


For processing afterwards, StarTools comes as a welcome breath of fresh air:)
HTH
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5 years 5 months ago #30751

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+1 for SAOImage DS9.
AstroImageJ is also good.
Last edit: 5 years 5 months ago by giorgio.
5 years 5 months ago #30813

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I use the THELI GUI for big and very big mosaic creation.
You can try my open project Astronomy Linux
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Last edit: 5 years 5 months ago by Oleg.
5 years 5 months ago #30830

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