new camera (imx571 sensor)can ayone do me a very quick sho process in PI

[iwols]

hi new camera and filters ,just tried some sho imaging(ic1396,elephant trunk) and not happy with my processed image ,can anyone do me a very quick sho process in PI please,3 stacked lights that have been calibrated with flats and bias but no darks and not much integration time ,but dont want to keep capturing if my settings are wrong,thanks

https://www.dropbox.com/scl/fo/f54gyt2ebbgs77c0d3i3x/h?rlkey=jhof52rdoyoxhrvmojrio5wrv&dl=0

[wimvb]

How many subs in the stacks? Not 3, I assume?

I may have a go this evening.

[JSeaman]

Here's a quick SHO with STF autostretch on each channel and then a bit of smoothing to deal with the small amount of data

[iwols]

3 hours ago, wimvb said:

How many subs in the stacks? Not 3, I assume?

I may have a go this evening.

approx 20 mins just need to know my camera is collecting data ok

[iwols]

5 hours ago, JSeaman said:

Here's a quick SHO with STF autostretch on each channel and then a bit of smoothing to deal with the small amount of data

thanks thats much better than my effort,means i can keep collecting subs thanks you

[JSeaman]

No problem, just using levels and curves in photoshop will give you a similar result. The data looks fine to use so snap away and process at your leisure!

[Budgie1]

Here you go Ian, I had a play with your files in PI.

I'm not sure how much data is in there but it's quite clean with little noise. This is using my basic workflow in PI with Histrogramtransformation stretch, normally I would use GHS for the stretch, and using the 3 XT scripts.

I've done nothing with the colours, other than a little enhancement to the blue, everything else is just using saturation after removing the green cast with SCNR.

[wimvb]

11 hours ago, iwols said:

approx 20 mins just need to know my camera is collecting data ok

I wonder if I got the same data as anyone else? i find that there are a lot of "hot pixels" in the masters that are difficult to remove with cosmetic correction in PI. This is probably due to there being only 6 or7 subs in each stack, too few for proper pixel rejection. The exposure time seems ok, as no stars are over exposed.

Here's a crop of the Sii master, showing the bad pixels

 

Edited September 8, 2023 by wimvb

[Budgie1]

27 minutes ago, wimvb said:

I wonder if I got the same data as anyone else?

No Wim, it's the same data.

When I took another look at the individual files, the Ha isn't too bad but there are still quite a few hot pixels. The Sii & Oiii files have about the same number of hot pixels, but not always in the same locations.

Here's a close-up of the same area on the three files:

[iwols]

19 hours ago, Budgie1 said:

Here you go Ian, I had a play with your files in PI.

I'm not sure how much data is in there but it's quite clean with little noise. This is using my basic workflow in PI with Histrogramtransformation stretch, normally I would use GHS for the stretch, and using the 3 XT scripts.

I've done nothing with the colours, other than a little enhancement to the blue, everything else is just using saturation after removing the green cast with SCNR.

Wow I'm beginning to think you didn't get the correct image data as well😊 that's a fantastic image you've made there  budgie out of approx 20 mins data,I could only dream of creating that image from my subs I really need a standard workflow for pi , which I seem to have struggled with for years once again thank you 🙏

[tomato]

Here is my quick effort, channels combined in APP, processed in PI and AP. There were a lot of hot pixels in the original combined image, some of which have  been toned down by NXT.

[iwols]

Thanks tomato another fine piece of processing need to take some darks and get a master dark I can use for a while as each sub is 50 mb to reduce processing time and learn how to dither thanks 

[gorann]

Clearly the camera works but there is a striking amount of hot pixels. What brand of IMX571 camera is it and what was the sensor temperature? My ASI2600MC (got three) and Omegon vetec 571C appear to have considerably less hot pixels (at -10°C).

[iwols]

41 minutes ago, gorann said:

Clearly the camera works but there is a striking amount of hot pixels. What brand of IMX571 camera is it and what was the sensor temperature? My ASI2600MC (got three) and Omegon vetec 571C appear to have considerably less hot pixels (at -10°C).

 

[iwols]

Hi gorann it's the Altair astro version and I didn't use any darks or dithering which doesn't help cheers  and -10 c

Edited September 11, 2023 by iwols

[wimvb]

My guess is that it's the low number of subs that prevented adequate pixel rejection. As the OP wrote, the purpose of the test was to evaluate settings, not to create a final image. The settings look ok to me.

[iwols]

9 minutes ago, wimvb said:

My guess is that it's the low number of subs that prevented adequate pixel rejection. As the OP wrote, the purpose of the test was to evaluate settings, not to create a final image. The settings look ok to me.

Thanks