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Messages - pfile

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1
General / Re: Not getting WCS coords in Fits Header
« on: Today at 08:43 »
hmm, it should end up with WCS coordinates after ImageSolver. are you sure the solve didn't fail?

rob

2
Bug Reports / Re: Baffled! Cant stretch?
« on: 2019 August 18 18:31:50 »
the green band indicates that the STF is active... it won't go away for any other reason than turning off the STF. so that's not a mystery.

you say "the image alters" ... "and the mask is not stretched"... which is it? when you say "alters" don't you mean it was stretched by the HistogramTransformation process?

rob

3
Image Processing Challenges / Re: NGC7635 Bubble
« on: 2019 August 18 08:52:52 »
nice!

4
General / Re: Downloading Scripts on to an iMac
« on: 2019 August 17 09:47:15 »
great - now i need to check out that script!

rob

5
General / Re: Downloading Scripts on to an iMac
« on: 2019 August 17 09:34:43 »
running the script won't add it to the scripts menu, so that's expected behavior.

if you moved the script to the src directory, you can try clicking Regenerate in the Add window and see if it's found.

rob

6
General / Re: STF & HT Are Not Applied in Final Image
« on: 2019 August 16 20:42:45 »
no i dont mean to ask if the STF process is still open, what i'm asking is if the image you've applied the HT to has a green stripe along the tab showing it's name over on the left.

if there is a green stripe, then the STF is still applied, and what you're seeing on the screen is the combination of the HT you applied and the STF. turning off the STF will show you what the data actually looks like.

rob

7
Image Processing Challenges / Re: NGC7635 Bubble
« on: 2019 August 16 14:52:42 »
2nd one does not look so bad... you might try following RickS's formula in this thread to fix up the SHO colors:

https://pixinsight.com/forum/index.php?topic=7751.0

rob

8
General / Re: STF & HT Are Not Applied in Final Image
« on: 2019 August 16 14:26:15 »
is the STF still turned on on the image when you think it looks right? if you turn off the STF before saving, does the image look like what the JPG looks like?

rob

9
the PI version of starnet++ was never released, to my knowledge. all that exists is a PI DLL for windows.

right now the only way to run starnet++ on a mac is to run it from the command line.

rob

10
General / Re: StarAlignment Register Union / Separate mode Bug
« on: 2019 August 16 10:10:34 »
i have seen this problem long ago, and i can't remember anymore if it was user error or not.

IMO it's a better idea to use the MosaicByCoordinates script to generate the input panes for GradientsMergeMosaic. there's essentially a 0% probability that MBC will fail, as long as you can successfully solve your panes with ImageSolver. with StarAlignment based methods eventually you get into a situation where you need to restrict star matching to previews as the mosaic grows and it's kind of a pain.

rob

11
in step #2 are you talking about AssignICCProfile or ICCProfileTransformation?

rob

12
Image Processing Challenges / Re: Non Linear PostProcessing
« on: 2019 August 12 12:06:42 »
well... the attachment is missing. can you try to post it again?

rob

13
Image Processing Challenges / Re: Curved mesh artifacts
« on: 2019 August 12 12:06:06 »
great - glad that worked. I've had this same problem with narrowband images taken from an extremely dark site...

rob

14
Image Processing Challenges / Re: Curved mesh artifacts
« on: 2019 August 11 11:36:36 »
they are probably calibration artifacts; I assume this is a narrowband image and as such the background is probably not much different than a dark. what happens is the master dark is a more precise measurement of the dark current in the sensor, and when you subtract that master dark from a subframe, there are pixels in the subframe where the dark current was lower than the average and as such the calibrated pixel would have a negative value... which gets clamped to 0 by imagecalibration.

so you then have these patterns of 0s in your calibrated frames, and when they are registered, tend to give you a moire pattern like you see in your image.

to see if this is your problem, you can open one of the calibrated subframes and apply the pixelmath expression iif($T==0,1,0) and you'll get an image where every pixel in the original image which is 0 is marked with a bright pixel. in a well-calibrated image you should get an all-black image after applying that expression... if you see a bunch of pixels lit up then you probably have the problem I am describing.

to get around this, you can add an output pedestal when calibrating the lights, try 100 DN or 200 DN or so and see what happens.

rob

15
General / Re: Processing STC Dual band filter images
« on: 2019 August 11 11:30:19 »
rather than relying on DBE to fix the balance, you can do BackgroundNeutralization (followed by ColorCalibration) to fix the colors. when doing BN, make sure to set the threshold high enough that the (higher valued) green pixels are considered by BN or else the results will not be as expected. or, you can use PhotometricColorCalibration to do it in one step, but you still need to configure the background threshold.

of course, if you have bad LP gradients, you can use DBE first and as a side effect it will mostly neutralize the background, but it's a good idea to do some sort of color calibration step after DBE.

rob

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