Modifying Overall Image Brightness
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You can generate lighter or darker versions of an image by varying the brightness fraction to be added to or subtracted from pixels.
Contributed by: Shadi Ashnai (March 2011)
Open content licensed under CC BY-NC-SA
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"Modifying Overall Image Brightness"
http://demonstrations.wolfram.com/ModifyingOverallImageBrightness/
Wolfram Demonstrations Project
Published: March 7 2011