Howdy, Stranger!
It looks like you're new here. If you want to get involved, click one of these buttons!
BlockHead
About
- Username
- BlockHead
- Joined
- Visits
- 257
- Last Active
- Roles
- Member, Administrator
Comments
-
Oh... my bad. You have loaded masters. So, I need to see the configuration you used when you loaded the RAW files in to create the masters. Yes, the flats will need to be bias subtracted if you do not have matching darks. Can you show *that* config…
-
Thomas, Your FITS header has either multiple conflicting information or the lack of it concerning the origin of the image. The issue is that the software you are using to create the images (you didn't say) is writing conflicting information or leavi…
-
Hi Ken, First things... In your screen capture it shows you are not calibrating your Flat field images. You do not have a matching dark frame for the Flats. Thus, it appears your intent is to use a bias frame to calibrate your Flats. This is fine as…
-
Post the screen shot of your control panel with the files set up. There should be no difference in the results. -the Blockhead
-
Ooooh...I have seen this before. Pedestals man... over/under correction always means pedestals. You have a calibration problem. It is either because you are attempting to use optimization (and if you are watching MY videos...you know to do this wit…
-
My gut says... the offset you apply to your sensor will be in both the darks and the lights. So when you subtract this is subtracted as well and you end up with the same issue as before. The problem really is the sky is so dark in NB filters... you …
-
Hi Gordon, There is nothing special about the parameters. I believe I used dilation of Mophological Transformation with a circular structure of 5 or 7. Then I applied convolution with an std of 2-3. That is pretty much it. Most of the time the dilat…
-
Roger, OK...worked it out. It IS confusing... but I basically made two mistakes: 1. I went on a slight tangent.2. I broke up the videos and made it impossible (without reviewing it) to see where i was picking up from. In the previous section #3, I d…
-
Thanks Roger..I think you are right...but I am looking at my recordings...I don't see a missing piece... I will work on figuring this out...-the Blockhead
-
Hi Shawn, WBPP will update when you restart PixInsight (if an update is ready).WBPP 2.1 will be released in a few days (probably this weekend).-the Blockhead
-
Great! Yes, Selective rejection will do the trick for you. You should try it...it is a good lesson and thing to know.(and if it is impressive..I would enjoy using it as an example!) -the Blockhead
-
One more thing... There is also a script call Linear Pattern Subtraction... it can be useful too.I will be highlighting this script soon. If you have many column defects..this might be the answer.-the Blockhead
-
Hi Grant, You are being a little tricky here! Look closely as your raw (uncalibrated) image. There isn't a distinct donut near the left side of the galaxy. However, in your calibrated image there *is* something that is in the flat field image (and s…
-
Ah... the triangle parts are due to the fact you have combined images that were rotated. There are different S/N in these regions. There isn't a way for DBE to overcome this really. When I have multi-night data of this sort- I do not try to correct …
-
Column defects probably should be taken out after the files are calibrated. Since the defect exists in the darks and flats- giving the calibration process the chance to do its thing first- then if those pixels are still no good- do the defect repair…
-
Hi Nick, Yes, I do think with a DSLR you will be fine with your 4pt plan above.However, and this part I cannot say, if your flat exposures are really short (like a second or so), you might not need that dark frame from the Flat. But with them in ha…
-
Yes...I can explain...wait! :)It has not been released yet. It will be available likely within the next handful of days.I am trying to stay ahead of the game by making the videos as current as possible.Usually people complain when there is a new ver…
-
Hi Nick, 1. Typically DSLR cameras do not fair well with "biases" ..you will want to create matched "darks" for your flats. Even if I am wrong (because this may very well end up being like a bias) you eliminate this as being a problem. Find the expo…
-
Hi Roger, A couple of things. 1. The rejection percentage I was talking about it probably going to refer to light frames.2. ESD does not behave the same way regular sigma reject algorithms work- and lower percentages (for rejection on light frames) …
-
Hi Dave, OK. Now I see something. But I am not certain I understand, I do see a gradient in the image (it isn't major). Mostly green ... brighter towards the bottom left. This is something DBE should be able to take care of easily. If this is the is…