PixInsight Forum

PixInsight => General => Topic started by: Herbert_W on 2011 November 13 11:15:51

Title: Hot Pixel removal
Post by: Herbert_W on 2011 November 13 11:15:51
Hi!

How is the process to remove hotpixels with PI - I cant find a possibility.
Has someone a good tip?

Thank you and greetings
Herbert
Title: Re: Hot Pixel removal
Post by: Lex on 2011 November 13 13:06:50
Herbert,

let the magic of DBE tool help you find the hotties...
Normally this clever feature irons out all kind of negative image stuff...

After applying DBE you can use ACDNR or GREYCstoration to combat more imperfections.

In fact there are several ways to track an eliminate parasites like hot pixels  ;D
Title: Re: Hot Pixel removal
Post by: jeffweiss9 on 2011 November 13 20:49:09
Herbert-
 Try the CosmeticCorrection script under utilities.   Works great for me.
-Jeff
Title: Re: Hot Pixel removal
Post by: zvrastil on 2011 November 13 23:34:01
Well, DBE is certainly not the right tool to remove hotpixels. DBE is designed to model and remove smooth large-scale gradients. Background interpolation can't model sharp pixel-size features like hotpixels.

On the other hand, CosmeticCorrection script is tool tailored to remove hotpixels, so it's probably best choice (even better is tool replacement of this script published here http://pixinsight.com/forum/index.php?topic=3483.0 (http://pixinsight.com/forum/index.php?topic=3483.0) by author Nikolay Volkov - but it's not part of official distribution).

ACNDR and GreycStoration could also help, but their purpose is general noise reduction, so they'd affect whole image, not just hotpixels.

regards, Zbynek
Title: Re: Hot Pixel removal
Post by: Herbert_W on 2011 November 30 20:23:50
Hi,

thanks for all your suggestions - greetings herbert
Title: Re: Hot Pixel removal
Post by: dayers on 2011 December 01 09:11:34
If you don't mind tracking down hot pixels one by one, the CloneStamp tool works great. Fast and effective. I haven't tried the CosmeticCorrection script, but I will.

Too many tools and too little time!

Dave
Title: Re: Hot Pixel removal
Post by: Herbert_W on 2011 December 05 08:51:24
Hi Dave!
Quote
Too many tools and too little time!
Yes, thats right  ;)

Best greetings
Herbert
Title: Re: Hot Pixel removal
Post by: oldwexi on 2011 December 05 10:55:18
Hi Herbert!
Have tried to write a very simple PixelMath solution
to remove Hotpixels already from the RAW images. Its not perfect. But works
in some cases... (One version for OSC-raws one for BW-raws)
Can show it to you on our
1. Austrian PixInsight User Meeting.
on January 7th 2012.

Aloha
Gerald