Man page or keyword search:   man All Sections 1 - General Commands 2 - System Calls 3 - Subroutines, Functions 4 - Special Files 5 - File Formats 6 - Games and Screensavers 7 - Macros and Conventions 8 - Maintenence Commands 9 - Kernel Interface New Commands Server 4.4BSD AIX Alpinelinux Archlinux Aros BSDOS BSDi Bifrost CentOS Cygwin Darwin Debian DigitalUNIX DragonFly ElementaryOS Fedora FreeBSD Gentoo GhostBSD HP-UX Haiku Hurd IRIX Inferno JazzOS Kali Knoppix LinuxMint MacOSX Mageia Mandriva Manjaro Minix MirBSD NeXTSTEP NetBSD OPENSTEP OSF1 OpenBSD OpenDarwin OpenIndiana OpenMandriva OpenServer OpenSuSE OpenVMS Oracle PC-BSD Peanut Pidora Plan9 QNX Raspbian RedHat Scientific Slackware SmartOS Solaris SuSE SunOS Syllable Tru64 UNIXv7 Ubuntu Ultrix UnixWare Xenix YellowDog aLinux   12896 pages apropos Keyword Search (all sections) Output format html ascii pdf view pdf save postscript

RLESPIFF(1)							   RLESPIFF(1)

NAME
       rlespiff - Use simple contrast enhancement to "spiff up" an image.

SYNOPSIS
       rlespiff	 [ -b blacklevel ] [ -s ] [ -t threshold ] [ -w whitelevel ] [
       -o outfile ] [ infile ]

DESCRIPTION
       Rlespiff "spiffs up" an image by stretching the contrast range so  that
       the  darkest  pixel maps to black and the lightest to white.  If the -s
       flag is given, the color channels will  be  treated  separately.	  This
       will likely cause some drastic color shifts.

OPTIONS
       -b blacklevel
	      The darkest input pixel will map to this pixel value in the out‐
	      put image.  The default is 0.

       -s     If specified, each color channel will be mapped separately.

       -t threshold
	      This argument controls the number of samples of  a  pixel	 value
	      that  should  be considered insignificant (and will therefore be
	      ignored).	 It is specified in pixels/million.  A threshold of  4
	      applied  to  a  512x512  image  would  mean  that any value that
	      existed at only one pixel would be ignored.  The	default	 value
	      is 10.

       -w whitelevel
	      The  lightest  input  pixel  will map to this pixel value in the
	      output image.  The default is 255.

       -o outfile
	      If specified, the output will be written to this file.  If  out‐
	      file is "-", or if it is not specified, the output will be writ‐
	      ten to the standard output stream.

       infile The input will be read from this file.  If infile is "-"	or  is
	      not  specified,  the  input will be read from the standard input
	      stream.

SEE ALSO
       urt(1), RLE(5).

AUTHOR
       Spencer W. Thomas

4th Berkeley Distribution	 June 12, 1990			   RLESPIFF(1)

Vote for polarhome