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Have you noticed how advanced Gimp has been with the new version 2.10 ?
Now it work perfekt to open Fits 32 bit floating point images and process them. I have tried this many times earlier but it never worked very good. Now it's like a dream to work with.
I'm in the learning process how to use Gimp's capabilities. I have now got the opening process of three grey rgb images to work. It's of course not very complicated, but for me who never used Photoshop or something simular it was and I had hard to find a tutorial for the new version.
I have now made a tutorial for this first step how to start with Gimp and open 32 bits separated color images:
If you already working with Gimp, have you found something of special interest ?
I currently am on holiday in my father's hometown, a small island near rhodes called symi.Symj, is a pretty small town,with only about 2000 residents.That means that the light pollution levels must be low. Acknowledging that, i called my friends, grabbed my 10x50 bins(that i got for 20€ from Turkey),and went on my way to find a dark site.About after 20 mins of walking (from the city),i stumbled upon a beach, it was dark, so i went in.There i decided to lay on a sunbed that was there.After looking up(not being dark adapted, my friends just kept turning their flashlights on for some reason), i saw the haze of the milky way stretching from Cassiopeia to cygnus and beyond!I was amazed as i ve never seen the milky way before and smudged it off as clouds until i confirmed it was the milky way from an app! The weird part was that at just straight overhead, was the port ,which had many lights, and as a result the sky appeared half bright and half dark. I turned over at Sagittarius and headed over the lagoon nebula. Brilliant! 3-4 stars in a line surrounded by bright nebulosity.(while still being in the haze!) Afterwards i headed to cygnus,it was a real light show! I saw the milky way layering on top of Cygnus while catching a glimpse of m23 and yet again, failing to see NGC7000 . Then, with the corner of my eye, i detected something moving, then turned over to Cassiopeia to see a shooting stsr!(it was my first time seeing one!!!) Was very brief, yet enjoyable. Right afterwards i turned over at the Perseus double cluster.Magnificent! Appeared as 2 small balls of light , almost connected yo eachother. Finally, i realised that finally, the target i was seeking to observe all year long, M31 was into the area with the light pollution! What a shame! While also being low on the Horizon, I couldnt see it with the naked eye. I observed it with ny binoculars for 10 minutes or so . The core was resolved nicely with some hints of outer nebulosity. Overall a great night and now, i wished i had my 8" dob with me....
(Sorry for any granmar mistakes, im currently typing this at 2 am xD)
When talking 32-bit files I normally feels that I'm safe with big margin to not clip any information in my astro image files when workning with them. But is it really so?
After some discussing I feel, why not try to make a Bit Resolution Calculator?
Here is my new Bit Resolution Calculator:
For sure there will be some mistakes in it. I correct it when I found something. The calculations are also simplified.
I'm a little bit surprised over the result, but still in the safe area when not doing something extrem.
Note this is a theoretical simulation and in real life there are a lot of noise that mask the rounding errors. But still interesting to test what happens in different situations.
By Ben the Ignorant
I made a lot of eclipse shots that turned out too dark because my Samsung phone camera is not sensitive enough (400 ISO), but treating these shots as deep sky images, stacking them and doing the processing magic, is it possible to make a few presentable views?
If someone is willing to try - no need to lose sleep over it - I'm posting the images by groups. Each group contains pics made seconds or tens of seconds from each other, not sure if the slight differences will make processing too hard. They were made with a Celestron 5 and an Explore 24/68 eyepiece. Focus seems to be accurate.