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Plan 9 - man page for xpand (plan9 section 9)

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XPAND(9.1)									       XPAND(9.1)

       xpand, picnegate - adjust dynamic range

       fb/xpand [ -s ] [ input ] [ lo hi [ inlo inhi ] ]

       fb/picnegate [ input ]

       Xpand  linearly	adjusts  the  dynamic range of the input picture (default standard input)
       mapping value inlo to lo, and inhi to hi.  Lo and hi default to 0 and 255.   If	inlo  and
       inhi  are  not specified, the lowest and highest pixel values in the input image are used.
       By default, then, xpand expands the image's dynamic range by mapping  its  smallest  pixel
       value  to  zero	and its largest value to 255.  Option -s causes all channels of the input
       image to be considered together when computing default values for inlo and inhi, thus pre-
       serving	the  hue of rgb pictures.  Otherwise, each channel is treated separately.  Option
       -s has no effect if inlo and inhi are specified on the command line.

       There is no requirement that lo be smaller than hi, or that inlo be smaller than inhi, nor
       that  any  of  those values be in the range 0 to 255.  Output values not in the range 0 to
       255 are clamped.  For example,
	    xpand 0 255 255 0
       inverts the pixel values of its input.  For convenience, picnegate is a script  that  exe-
       cutes this command.



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