Tuesday, December 14, 2010

The science of lightness perception

In setting 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.

Anchoring: anchoring takes the highest relative luminance in a framework and maps it to white.

Articulation: refers to the number of tonal values within a framework.

Brightness: also called luminosity, brightness refers to perceived luminance.

Contrast: is defined in lightness perception science as a luminance ratio.

To be continued ...

Enjoy.

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