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Messages - andyc67

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1
General / Re: Saturated areas
« on: 2017 August 31 20:32:11 »
That is possible however the files that I was working with were not debayered. I don't think it matters though.

2
General / Re: Saturated areas
« on: 2017 August 31 17:52:16 »
Yes Ram told me and that's what prompted me to start this thread. I have PI set to open the files as pure RAW but I think that PI converts those to 16 bit greyscale.
Also the readout tool is no longer working on the current version of PI. At least it isn't on my iMac with the mac mouse so I can not change the readout mode. I am using the statistics process. I think it defaults to 16 bit readout, I will have to check and se if I can change it to 14 bit.
I actually abandoned HRD composition for this task. I am calibrating the files with PI then using photoshop for the blending of the various exposures. The issue is that the areas that should be saturated are no longer saturated after I run them through PI.

3
General / Saturated areas
« on: 2017 August 31 13:22:52 »
While processing images from the recent eclipse I noticed something interesting:
The frame in question is a single 1/2s frame at ISO 200 f7.1 of the corona. There is a large area that is saturated as expected.
What I don't quite understand are the following stats of a sample of the saturated areas.

CR2 file no calibration:

count (%)   100.00000
count (px)  107500
mean        65535.0
median      65535.0
avgDev      0.0
MAD         0.0
minimum     65535.0
maximum     65535.0
No surprise there

CR2 file flat corrected only:

count (%)   100.00000
count (px)  107500
mean        56112.135
median      57724.291
avgDev      5694.467
MAD         7432.285
minimum     42047.808
maximum     65535.000



CR2 file flat corrected and bias subtracted:

count (%)   100.00000
count (px)  107500
mean        52290.342
median      54383.518
avgDev      6557.315
MAD         6051.540
minimum     36215.576
maximum     65377.991

So it looks like some of the pixels that have no information because they are saturated, after calibration have an actual value that is below saturation. That is not real information of course.
Can this potentially throw off HDR composition?


4
That's awesome thank you! I use a NABG camera and this going to be useful.

5
General / Re: Moving files from CCD Stack to PI
« on: 2015 November 03 12:11:33 »
Interesting, I wonder why it's not working for me. I'll look further into it when I get home this coming Friday. I might ask you for what settings you use on both programs if you don't mind.
One o my CCDs is the qsi532 which has the same chip as yours.

Andy

6
General / Re: Deblooming, what am I doing wrong?
« on: 2015 October 30 14:44:39 »
Jim, I have plenty of bloomed images that I can give you. Unfortunately I'm traveling until the end of next week and don't have access to my image server. I can send you the FIT files when I get back.

Andy

7
General / Re: Deblooming, what am I doing wrong?
« on: 2015 October 25 17:47:20 »
Thanks for the great advice!
I will try the masked denoise and if it all fails the inpaint technique.

8
General / Re: Deblooming, what am I doing wrong?
« on: 2015 October 24 16:54:02 »
I will try that. I had the binarizing threshold already at 0.25. and also reduced the mask growth. My suspicion is that I need more intermediate exposures.

9
General / Re: Deblooming, what am I doing wrong?
« on: 2015 October 24 16:42:56 »
I don't have Maxim but I do have CCD Stack which also removes blooms. That is my fall back plan but due to FIT compatibility issues I have to resave my subs in TIFF format. Not a big deal as they are still 16 bit and then from there I pick up with Pixinsight.

10
General / Deblooming, what am I doing wrong?
« on: 2015 October 24 15:56:49 »
I tried a few times now with no success.
I understand that to remove blooms I have to use HDR techniques. Here is an example of an HDR composition of a stack of 5min subs and a stack of 30s subs. The 30 s subs are not bloomed. This is the best I get. What is the correct way to get rid of blooms?

11
General / Re: Moving files from CCD Stack to PI
« on: 2015 October 24 15:53:52 »
Thanks Jim!
I actually have been using PI only for a few years now. The issue is that I can never get a good bloom rejection, even when I do HDR composition using different length exposures. CCD Stack does a very nice job rejecting blooms, of course there is some data loss but the effect is aesthetically pleasing.
Here is an example of a bloomed star that I tried to mitigate with HDR composition in PI. I will start a new thread about this topic.

Andy

12
General / Moving files from CCD Stack to PI
« on: 2015 October 23 17:14:04 »
This has been marginally discussed before. I am trying to debloom my FITs first with CCD stack and then calibrate/process as usual with PI. I have no idea how CCD Stack saves FIT files but I can not make PI work with the output from CCD Stack.
It will work if I save the files in 16 bit TIFF format.
Rather than dealing with figuring out how the FITs are saved I prefer this route. However, are there any downsides to doing this?

Thanks!

Andy

13
General / Re: Max number of subs for image integration?
« on: 2015 August 19 13:02:23 »
Thanks! I use OS X that explains it.
I will try the workaround. I have been stacking the files in batches then stacked the resulting partial stacks.
Thanks for the great info!

Andy

14
General / Max number of subs for image integration?
« on: 2015 August 14 10:28:09 »
Is there a max number of frames for image integration?
If so what is it?

Thanks!
Andy

15
General / Re: Star Deblooming
« on: 2015 June 17 21:35:38 »
I am using a trial version of CCDSTACK and so far it's doing a very good job at removing blooms. That is a less expensive alternate to Maxim.

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