Amp glow

@mannymo63

Hi Manuel, what camera do you use? Normally amp glow can be processed out by using the correct darks. What exposure time, gain and temperature were the lights and darks taken at?

Thanks, Wouter

ZWOASI294 PRO, 120g/300s subs/-10*

Yes that camera is notorious for its problematic amp glow. I have read reports of many users on several forums who were struggling with the amp glow produced by this camera. I am not sure how to solve it unfortunately. Maybe the ZWO forum can help you? In any case, this is not an APP thing but really related to the camera. 

Wouter

And how does your masterdark look like @mannymo63 ?

@wvreeven

I’m currently redoing all my calibration files and will also make masters according to Sara Wager tutorial video. I will follow up afterwards. Yes, I’m aware of ZWOASI294 PRO reputation with amp glow, but my main issue is trying to process it out. I will also visit the ZWO forum. Thanks😊👌🏾

@mannymo63

Good idea to redo your calibration files. It is very hard to process it out once it slips into your image integrations. I hope the new calibration files solve your issue.

Wouter

After processing a picture this is the results. I have a huge spike in the upper right corner. I dont want to crop it due to cutting out the subject. The other picture is straight off of ASI AIR (non-processed). I've redone my master calibration files using Sara Wager's video tutorial and do not believe I've done anything out of order. This is killing me

So can you show a screenshot of what your masterdark looks like? And also check if the adaptive pedestal is on in tab 2, normally this is the case already.

I have the same camera and yes it has bad amp glow I would say but its easily calibrated out with proper dark frames. Just make sure your darks are the same temperature, gain, offset and time. APP does a great job of calibrating out this amp glow.

EDIT: Even if your exposure time is not the same, APP can scale the dark and still do a good job of calibration.

Yes, APP is indeed able to correct severe amp-glow as well, so I'm also wondering if the calibration data is correct.

Thanks Manuel, I'll have to look tomorrow (or maybe Wouter still is up 🙂 ). We'll try to get this sorted.

@mannymo63 Ok, to be able to investigate further, could you also share a single dark frame and a single light frame?

I believe I have solved the issue. My dark flat and flat files were in the wrong folders. I produced 2 subs that displayed with no amp glow so far. Thanks for your assistance. 
Manuel

You mean you loaded them in with the wrong buttons in app?

Hi everyone,

This is about the best thread for me to post to.  I have a ZWO ASI183mm pro cooled mono and am just getting to know it, and APP.   I just downloaded the program last week.  As everyone here and elsewhere have noted, the 183 sensor produces quite a bit of glow.  I was stunned to see how pronounced it was but confident I could weed it out with APP settings suggested.  I moved specifically from DSS to APP to be able to make that happen.  I had very little luck with my first session and just ended up using the healing brush in photoshop to brush it out just to get a decent pic of the Rosette Neb.  It was taken in LRGB at Unity gain (111) and 180 sec exposures (I understand that was likely a bit much :-).  So I read a bit more and thought that maybe cutting back the gain to about 50 and the subs to 30sec, I might have better luck...

Last night, my plan was to take 60 subs of 30sec each at a gain of 50 (ended up at 51.  I couldn't move the slider in small enough increments) in each channel (LRGB) of the Cone/Christmas Tree Nebula.  Unfortunately some high cirrus snuck in and ruined the light subs from about halfway through red all the way through the G/B.  I did however capture 60 nice Luminance subs that I integrated via APP.  Here is a snapshot.  Note the amp glow along the right side.

I also took 30 Dark frames same gain and exposure and temp (10.4 deg). Note the same area of glow.

I have tried to get the glow out by integrating all the single darks and all the single luminance shots.  I have tried integrating all the Luminance with a single master dark.  I have tried all the darks with a single integrated luminance, and I've tried integrating two integrated master luminance and master dark.  In the 2) Calibrate tab, I have the Adaptive pedestal reduce amp/glow box checked.  Still no luck.

I've read in numerous places that having that box checked in APP should get rid of the amp glow.  I obviously have some other box checked or not checked that is causing this not to work.  Anyone have any pointers or a work flow I can go to?

Also, maybe I'm not cold enough on the camera???

Thanks,

Jeff

That glow shouldn't be a problem at all. So my guess is that there is an issue with your dark frames. Do you take them at the same temperature and everything as the light? Offset is positive as well etc?

Thanks for replying Vincent.  I truly appreciate it.  I will go back and make sure I look at everything. 

All I do is take the lights, then move my equipment indoors to a dark room in my home and then shoot the darks.  I don't touch the camera "settings" in APT.  I put the lens cover on in the dark room, confirm APT settings are the same for the exposure, binning and number of frames (I shot 30), cool the camera to the same setting I had when outside (10.4 deg F), and press start.  I don't mess with camera "settings" for gain and offset, leaving them as they were when I shot the subs.  I have never actually opened the "settings" tab to confirm the settings stay the same prior to shooting the darks but am assuming it doesn't change if I don't change them.

I'll take a look at that and the other settings later today when I get home from work to confirm.

Thanks again,

Jeff

Yeah just to confirm that would be nice, just carefully check all parameters. If those remain the same I'll ask for some data to check myself.