ppmfade

       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.
              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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