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Messages - vicent_peris

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16
New Scripts and Modules / Re: Subframe Selector PCL Module
« on: 2017 November 17 03:31:26 »
Hi,

Congratulations for your new module. I want to add a couple ideas:

- I also think the cumulative probability graph can be very useful to establish a threshold.

- Since this is a PCL module, I think it would be really useful if your tool is able to monitor a directory to analyze newly saved images. To would be open the possibility to monitor in real time the image quality while acquiring data (inside or outside PixInsight).


Best regards,
Vicent.

17
Wish List / Re: Photometric Color Calibration - ROI for PCC
« on: 2017 September 14 17:20:30 »
Hi Herbert,

Yes, the ROI is already in our list of upcoming features for this tool and, in fact, probably will be the next update. The ROI is also needed because it can be problematic to measure color inside some extended objects. For instance, we have had problems measuring color in a picture of M31; not because PCC fails, but because M31 is a very complex object and it's difficult to do the photometry in the same way as it has been done in the star catalog. For that picture, a ROI outside the galaxy works very well.

Best regards,
Vicent.

18
General / Re: PhotometricColorCalibration results look too green
« on: 2017 September 09 12:11:31 »
Hi Mark,

Thanks for the info. The problem should be then with the debayering algorithm. Which debayering method are you using? I guess you're using VNG. Could you try with Bilinear?

Best regards,
Vicent.

19
Hi,

I just wrote an article with Juan about the new PhotometricColorCalibration tool. You can read it following the link below:

https://pixinsight.com/tutorials/PCC/index.html

The article is focused on our philosophy of color and how it is applied in the tool, along with a description of the specific features of PCC. Finally we give some usage advices for you to apply correctly the tool and to help you to solve any possible pitfall.

We hope this article will be helpful for you.
Enjoy!
Vicent.


20
General / Re: My Review of PCC
« on: 2017 September 07 22:02:45 »
Hi Bob,

Thank you very much for your review, I really appreciate it. We are releasing today an article about the tool, it gives some details to some questions you write in your review:

http://pixinsight.com/tutorials/PCC/index.html

Best regards,
Vicent.

21

  PCC has an option to do background neutralization so you don't need to do this separately.

Cheers,
Rick.

A quick question. Given that PCC has the inbuilt Backgroun Netralization, do we still need to do a small preview of the background? There does not seem to be any option in the PCC dialogue box to select a background preview image.

Thanks,
Rodney.

Yes. You have the "Region of interest" in the background neutralization section. Create a preview and select it by pressing the "From preview" button.

Best regards,
Vicent.

22
General / Re: PhotometricColorCalibration
« on: 2017 August 24 07:34:28 »
Hi Marzio,

I just found the problem: the Vizier database gives errors in this sky area. If you decrease the limiting magnitude to 7, you get 2000 stars in a field of 2-3 degrees! This is the workaround:

- Create a preview around NGC6888. Mine was around 1000 pixels wide.
- Create a new, independent image from the preview and apply PCC to it. Don't apply PCC to the preview but to the new image.
- Take note of the RGB weights in the console.
- Apply a PixelMath process by multiplying each color channel of the full image by its corresponding weight. The weights I get are 0.824 for R, 0.868 for G and 1 for B.
- Apply BackgroundNeutralization manually.

In an upcoming version of PCC you'll be able to define a region of interest in the image, so it will be possible to apply this workflow directly in PCC.


Best regards,
Vicent.

23
General / Re: PhotometricColorCalibration
« on: 2017 August 24 03:15:48 »
Hi Marzio,

Could you please upload the file to Dropbox? I will take a look to see what happens. The parameters in PCC seem OK to me.

Thanks,
Vicent.

24
Hi Dave,

Don't worry, you can ignore this warning. It simply means that the dark signal in your flats is completely insignificant compared to the signal of the flat itself. In practice, this means that there's no difference whether you subtract or not the dark from the flat. This usually happens when your flats have very short exposure (a few seconds).


Best regards,
Vicent.

25
Hi Bob,

For the moment, the only photometric catalog available in PCC is APASS. SDSS could be available in the future, but a few updates of this tool have higher priority.

Best regards,
Vicent.

26
General / Re: PhotometricColorCalibration
« on: 2017 August 06 14:22:21 »
Hi Bill,

Please could you upload one of your images?

Please take into account that PCC should be applied before stretching the image.

I'm preparing an online article about this tool.

Best regards,
Vicent.

27
Announcements / Re: PixInsight 1.8.5 Released
« on: 2017 August 05 00:20:23 »
Hi,

Please be patient. We are working on online articles describing some of the key new features included in version 1.8.5.

Best regards,
Vicent.

28
Hi Wolfgang,

In a given image it doesn't make any sense to use both PCC and CC because they simply do the same task. But PCC is not a replacement of CC. They represent different approaches to color in astrophotography:

- In ColorCalibration, you apply a white balancing relative to the image itself. In some cases, this is a good approach because you optimize the color representation inside the local white reference.
 
- In PhotometricColorCalibration, you refer the color representation of your picture to a source that's not inside the picture. This is a good approach when you want to know how the color of your picture is compared to a fixed white source. For instance, you can select the generic spiral galaxy white reference and apply it to multiple galaxy photos; some of them will be redder, some bluer, but all of them share the same white point.

In my opinion, we have now the complete set of color calibration tools in PixInsight. Now you have the freedom to choose one or another according to your personal preference and your goal with your picture.


Best regards,
Vicent.

29

PixInsight -n=2 will launch a second instance of PixInsight. Type "PixInsight --help" from the system console.

V.

Actually, what I tried to achieve was to start PixInsight in the background and then run my scripts in the running PixInsight instance (i.e. not in a new instance).

Sorry, this is not possible at this moment. But I think there are plans for that.

For the moment, you should launch PixInsight each time.


V.

30
I actually tried that by first starting PixInsight in the background and then executing the script. I get the output:

PixInsight Core 01.08.04.1198 Ripley (x64)
Copyright (c) 2003-2016 Pleiades Astrophoto

* Yielded execution to running application instance #1


Unfortunately, nothing happens in the running instance :-(

PixInsight -n=2 will launch a second instance of PixInsight. Type "PixInsight --help" from the system console.

V.

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