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 transition.

       -shift The pixels in the first image will be shifted  fur­
              ther  and  further horizontally from their original

              the final image.

       -relief
              The first image is faded to a Laplacian relief fil­
              tered 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" ver­
              sion 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  ver­
              sion  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" ver­
              sion 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.

       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.


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