What is drizzling, how does it work and how to do it in PixInsight

[@astrojourneyuk]

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[@SKYST0RY]

That was an excellent and clear explanation.

[@astrojourneyuk]

Thank you, I’m glad you found it helpful and clear.

[@anata5127]

You need to use BlurXT to see real difference that drizzling makes. Drizzling is must for OSC camera and mini camera with image scale >1.5”/pixel. If image scale >2”/pixel then 2x is used. Otherwise, 1x or 2x doesn’t make difference. In any case, it is important dithering every 2 min to get better drizzling outcome. So, if frames are 5 min long, then dither every frame.

[@craiglowery4427]

Thank you for explaining drizzle. I was thinking that the different functions like circular, square, etc may come into play at much higher focal lengths.

[@SimonsAstro]

Excellent Tutorial Marc, I watched it all the way through, trying desperately to learn about Drizzling. It all went in mate, but how much of it will stay, is another matter! Ive not drizzled before and I think I need to as my combination of Esprit 120 & 2600mm I think is a little under sampled at 0.9 with ok seeing and 1x1 binning. I do have blocky stars if I zoom right in! Thanks for sharing this, I may just need it👍 Clear skies!

[@astrojourneyuk]

I think anyone with a 2600 is likely to have a level of under sampling but yeah, drizzling to the rescue. As Glenn said, if it’s good enough for NASA. 😀

[@joedenisco6033]

Hi, Excellent video. I have what is probably a very dumb question. After you drizzle in WBPP, you are left with a file that is the Drizzle file(which is smaller) and a master undrizzled stack file. Am I supposed to combine them in some way when I start to process the files? I've been clicking on the "Drizzled" file and then I do my DBE, Color Calibration, BlurEX, NoiseEX, StarEx, GHS... I have a feeling I have to combine the Drizzle and master somehow. Am I doing something wrong? Thank You! Joe D

[@CDigata]

whats your view on amount of pixels to dither and amount of subs to dither 🌨💧💧

[@astrojourneyuk]

It’s just meant to be the more the better, similar to integration in general. I did read that it should be at least 15 subs but then everyone’s images should be more than that anyway. In terms of the settings the best thing to do is use the default settings and tweak it from there. Typically 1.5 to 2x drizzle is recommended although you can’t do 1.5x in PixInsight anyway so 2x it is! 😀

[@CDigata]

@@astrojourneyuk yer sorry I ment how many subs eg: I dither every 10th sub on 60s exp and still every 10th sub on 180s exp but wonder if I should do it every 5th sub

[@astrojourneyuk]

There are a lot of discussions on the forums about how often to dither and I dither every 5 frames of 5 minutes, but others are dithering every 180s so if you have a sub of 180+s then dither every from. It feels a little excessive. I’ve not seen walking noise with dithering every 5 frames. However, if your going to need to drizzle you’ll need more dithered frames for it to work properly I would have though.

[@sarahjanereilly9335]

@@astrojourneyukI am about to start working on data that was dithered every other frame, 60 x 5 min subs. Will that enable me to drizzle? Many thanks.

[@skygazr33]

Thanks for the video. Needed to expand my knowledge on drizzling when I tested BlurXTerminator 4.0 and it didn’t do anything for under-sampling. But BlurXTerminator 4.0 with a 2X drizzle is amazing. Next, going to test with a 1X drizzle.

[@pompeymonkey3271]

Unfortunately, you had many to few subs to make the drizzle very effective. It doers work well with 30+ subs per channel. :)

[@astrojourneyuk]

Yeah, I’m not sure if I mentioned it should be at least 15. I will try with more to compare. Thanks Pompey Monkey. (You a Portsmouth fan?)

[@jesuschrist2284]

Always dither always drizzle

[@sourcetext]

Stop. Give us a break😂 drizzle is a short rain 😂😂😂😂

[@astrojourneyuk]

😂😂😂