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PPMFADE(1)							    PPMFADE(1)

NAME
       ppmfade	-  generate a transition between two image files using special
       effects.

SYNOPSIS
       ppmfade	  [    -f    first.ppm	  ]    [    -l	  last.ppm     ]     [
       -mix|-spread|-shift|-relief|-oil|-edge|-bentley|-block ] [ -base name ]

DESCRIPTION
       This  program generates a transition between either two input images or
       between one input image and black.  You can  use	 the  30  intermediate
       images  generated  to  show  a  smooth transition between segments of a
       movie.  The input and output images are in the  Portable	 Pixmap	 (PPM)
       format.	If you specify both input images, they should both be the same
       size.  If you want to fade from black to an  image,  specify  only  the
       last  image.   If you want to fade from an image to black, specify only
       the first image.	 ppmfade names the  resulting  image  files  base.nnnn
       .ppm,  where nnnn is a number varying between 0001 and 0030 and base is
       what you specify with via the -base option (default fade).

       Another way to convert by steps from one image to another is  morphing.
       You can use xmorph to do that.

OPTIONS
       -f first.ppm
	      This  is the image file (PPM format) to be used at the beginning
	      of the transition.  If not specified, the fade will  start  from
	      black.

       -l last.ppm
	      This  is the image file (PPM format) to be used at the ending of
	      the transition.  If not specified, the fade will end with black.

       -mix   The two images are superimposed with the brightness of the first
	      image  decreasing	 from  full  to none and the brightness of the
	      final image increasing from none to  full.   The	transition  is
	      quadratic	 in brightness with faster transition in the beginning
	      and slower at the end.

       -spread
	      The pixels in the first image will be moved (spread) further and
	      further  from  their  original  location and then moved into the
	      proper location in the final image.  This is the default transi‐
	      tion.

       -shift The  pixels  in the first image will be shifted further and fur‐
	      ther horizontally from their original location  and  then	 moved
	      into the proper location in the final image.

       -relief
	      The  first image is faded to a Laplacian relief filtered version
	      of the first image.  This is then faded to  a  Laplacian	relief
	      filtered	version	 of  the second image and finally faded to the
	      final image.

       -oil   The first image is faded to an "oil  transfer"  version  of  the
	      first image.  This is then faded to an "oil transfer" version of
	      the second image and finally faded to the final image.

       -edge  The first image is faded to an  edge  detected  version  of  the
	      first  image.  This is then faded to an edge detected version of
	      the second image and finally faded to the final image.

       -bentley
	      The first image is faded to a "Bentley Effect"  version  of  the
	      first  image.   This is then faded to a "Bentley Effect" version
	      of the second image and finally faded to the final image.

       -block The first image is defocused to small blocks.  The small	blocks
	      are  converted  to  match a defocused version of the last image.
	      The block version of the last image is then focused to the final
	      image.

       -basename
	      This forms part of the output filenames, as described above.

       EXAMPLES
	      ppmfade -f teapot.ppm -l pyr.ppm

	      Fade  from  teapot.ppm  to  pyr.ppm  generating fade.0001.ppm to
	      fade.0030.ppm using the "spread" transition.

	      ppmfade -l teapot.ppm

	      Fade  from  black	 to  teapot.ppm	 generating  fade.0001.ppm  to
	      fade.0030.ppm.

	      ppmfade -f teapot.ppm -base end

	      Fade   from  teapot.ppm  to  black  generating  end.0001.ppm  to
	      end.0030.ppm.

SEE ALSO
       tontsc(1), sgifade(1), smart_vfr(1), xmorph(1), ppm(5),

AUTHOR
       Wesley C. Barris (wesb@msc.edu)
       Army High Performance Computing Research Center (AHPCRC)
       Minnesota Supercomputer Center, Inc.

1				 April 1, 2000			    PPMFADE(1)
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