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Old 03-07-2016, 05:45 PM
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luka
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Software to analyse noise in dark images

Hi

I will be finishing my cold-finger cooled DSLR soon and would like to profile image noise vs sensor temperature. What (free) software can analyse images and calculate noise from them?

Thanks
Luka
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Old 03-07-2016, 07:42 PM
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Shiraz (Ray)
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Iris is great. http://www.astrosurf.com/buil/us/iris/iris.htm

1. load an image.
2. manually select a small region in an image where there is no structure and no obvious hot pixels, right click on it and select "statistics" - "mean" gives you signal and "sigma" the noise power. The main idea is to get a large enough region that the SD is meaningful, but you need to ensure that you don't include abnormal outliers (hot/warm pixels etc) that could distort the result.

Last edited by Shiraz; 07-07-2016 at 11:41 AM.
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Old 07-07-2016, 11:10 AM
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Thank you, works wonderfully!!!
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