Author Topic: New tutorial: Master Calibration Frames: Acquisition and Processing  (Read 35422 times)

Offline vicent_peris

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Hello,

just released a new tutorial about creating master frames for calibration. It explains several things I've learnt during the last 4 years about calibration. In fact, ImageCalibration does the image calibration exactly as I do it. In this article, I also explain how I obtain the master calibration frames.

I encourage to read it because:

- It will show you how to get the best of the new ImageCalibration tool. Good calibration is impossible without good masters.
- It will show you some practical uses of ImageCalibration and ImageIntegration tools. You will understand better some of the parameters in these tools.
- I think you will learn some new aspects about image calibration.

I plan to release in the near future an article about superflatting. For the moment, hope you will enjoy this one:

http://pixinsight.com/tutorials/master-frames/en.html


Regards,
Vicent.

Offline mmirot

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Nice Article Vincent.

Can you explain what clipping the upper range at .98 does?

Should it allway be this value?

Max

Offline Niall Saunders

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Yes - good work Vincent.

My question (not yet having had a chance to 'experiment' with IC and the new II) concerns the difference between the 'Sigma' and the 'Range' sliders in the new ImageIntegration module.

Is there a simple answer, or should I get home and read the ToolTips, and then start 'tweaking' to see if I can figure out what they do :cheesy:

Cheers,
Cheers,
Niall Saunders
Clinterty Observatories
Aberdeen, UK

Altair Astro GSO 10" f/8 Ritchey Chr├ętien CF OTA on EQ8 mount with homebrew 3D Balance and Pier
Moonfish ED80 APO & Celestron Omni XLT 120
QHY10 CCD & QHY5L-II Colour
9mm TS-OAG and Meade DSI-IIC

Offline vicent_peris

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Nice Article Vincent.

Can you explain what clipping the upper range at .98 does?

Should it allway be this value?

Max

Yes - good work Vincent.

My question (not yet having had a chance to 'experiment' with IC and the new II) concerns the difference between the 'Sigma' and the 'Range' sliders in the new ImageIntegration module.

Is there a simple answer, or should I get home and read the ToolTips, and then start 'tweaking' to see if I can figure out what they do :cheesy:

Cheers,

Hi!

The range values will simply ignore saturated and zero pixel values, as they can't represent any physical data.


Vicent.

Offline mmirot

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That's what I thought. I imagine 0.97-0.99 should be optimal on the high end.

Do you save the outputs as 16 bit unsigned interger? 

Max

Offline vicent_peris

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Do you save the outputs as 16 bit unsigned interger?

No, 32 bit fp, specially if you take a bunch of bias and darks. HDDs are cheap.  ;)


Vicent.



Offline Harry page

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Hi

I can not get your mouseover images to work !

Harry
Harry Page

Offline vicent_peris

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Hi

I can not get your mouseover images to work !

Harry

Wait several seconds until the image changes.


V

Offline Harry page

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Hi

I have tried that and still no joy the old tutorials work with mouse over  ???

Harry
Harry Page

Offline Harry page

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Hi Again

The side bar options do not work either  ???  says error on page


Harry
Harry Page

Offline vicent_peris

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Hi

I have tried that and still no joy the old tutorials work with mouse over  ???

Harry

See the code of the webpage. The file names of the images are in the code, so you can download them and see in your computer. It's an alternative solution...


V.

Offline vicent_peris

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Hi Again

The side bar options do not work either  ???  says error on page


Harry

What browser are you using?

V.

Offline Harry page

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Hi

I am at work so on IE 8 I know go get firefox  :o  will try when I get home


Harry
Harry Page

Offline Niall Saunders

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Harry,

Try enabling the 'compatibility' mode of IE8 (i.e. the mode that makes IE8 'compatible' with every other browser on the planet).

It is useful when, like me, you are tied to some crazy IT department's notion of 'reliable software' ::)

If possible, like me, change to Firefox, and never look back ;D

Cheers,
Cheers,
Niall Saunders
Clinterty Observatories
Aberdeen, UK

Altair Astro GSO 10" f/8 Ritchey Chr├ętien CF OTA on EQ8 mount with homebrew 3D Balance and Pier
Moonfish ED80 APO & Celestron Omni XLT 120
QHY10 CCD & QHY5L-II Colour
9mm TS-OAG and Meade DSI-IIC

Offline bitli

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I do not want to enter the browser war, but I have the same problem on Chrome.

Looking at the development console I have tons of:

Uncaught TypeError: Cannot set property 'src' of undefined

at en.html:164, 166, 168, ...

I seems not recognizing document['MO04'] in the mouseover event (or other images), although they are defined with the proper id.

--
bitli