Imitating nighttime to the human eye

Volcanic Aurora Boreal
Photo Information
Copyright: Fredrik Holm (fredi) Silver Note Writer [C: 0 W: 0 N: 33] (200)
Genre: Landscapes
Medium: Color
Date Taken: 2005-03-25
Photo Version: Original Version, Workshop
Edited by: Peter Stoeckl (peter_stoeckl) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1738 W: 291 N: 4005] (11530)
Edited Image Upload Date: 2006-05-18 02:11:27
Categories: Mountain, Sky
Camera: Canon EOS 300D, EF-S 10-22 F3.5-4.5
Exposure: 4, 22 seconds
Details: Tripod: Yes
Workshop Note
Taking long exposure pictures at moonlight night time inevitably delivers results that look quite unusual to the spectator in their colourful sunlight and daytime appeance as the human eye unusally does not record any reflected colours of landscape at moonlight, while the aurora boralis will certainly appear very colourful due to its sufficient brightness to activate the colour sensitive cells of the human retina.

I have tried this workshop to imitate an impression that might be looking more realistic to human perception - a guess only, of course, as I never have seen the phenomenon contributed by Fredi.

Photoshop Elements
1. Brightness reduced - 50
2. Contrast increased + 20
3. Saturation of red and yellow strongly reduced to make the landscape appear "grey nighttime", saturation of green slightly increased.

Step 3 is the essential one, and only the person who has witnessed the scene will find out the most realistic settings of selective desaturation.

Best regards,
Peter
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goldfinchtr, firelord, SunToucher, horia, fherrerav has marked this workshop as useful.
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