Sunday, December 19, 2010

The science of lightness perception - part 5

In continuing to set the stage for my review of the new PercepTool2, and realising that many don't yet have George DeWolfe's Book, B&W Printing, I'm going to present some of George's glossary terms in this and the next few posts.

George notes that many of the words that he uses have additional meanings in other contexts, but are used here as they relate to the science of lightness perception. I'll present the basic information. Readers are encouraged to get George's book in order to dive into the details.

Presence: the quality of good brightness constancy and high articulation of black/white values in an image.

Proximal stimulus: the image received by the retina in the human eye.

Reflectance: a measure of the percentage of incident light reflected from a surface.

Reflectance edge: an actual edge in an image that is revealed by a change in reflectance.

To be continued ...


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