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http://www.ppmag.com/web-exclusives/2007/12/what-is-a-histogram-and-how-do.html

These are the public entries for this link:

• Understand a Histogram
  a photograph's histogram
  By theCoup in design & dev apps & util with histogram photos
• How To Read and Understand a Histogram
  Professional Photographer Magazine Web Exclusives
  By spidermanski in Public bookmarks with digital.imaging technical

NB: The average rating is calculated using the rating for both public and private entries for this link.