What is it called when the 1-2-pixel-wide outline of a sprite is faded against its background?

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Posted By
Scott H
Jan 15, 2008
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For example, on the new Yahoo! Chess boards, the outlines of the pieces are faded against the chessboard tiles.

1. What is this graphical effect called?
2. What formula is used to calculate the RGB values of the faded pixels?
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background fade outline pixel wide

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MR
Mike Russell
Jan 15, 2008
"Scott H" wrote in message
For example, on the new Yahoo! Chess boards, the outlines of the pieces are faded against the chessboard tiles.

1. What is this graphical effect called?

Alpha compositing, or compositing for short, is probably the most common term for this.
http://en.wikipedia.org/wiki/Alpha_compositing

2. What formula is used to calculate the RGB values of the faded pixels?

A weighted sum, based on the percent overlap of the object of the background and foreground color values for each channel.
—
Mike Russell – www.curvemeister.com

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