6.  Pixel Functions  

(pixel? x)

Returns #t iff x is an object of type pixel.

(pixel-value pixel)

Returns the value of the pixel as an unsigned integer.

(black-pixel display)
(white-pixel display)

See XBlackPixel, XWhitePixel. Returns the black/white pixel of the display's default screen.


Markup created by unroff 1.0,    September 24, 1996,    net@informatik.uni-bremen.de