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 transition.

       -shift The pixels in the first image will be shifted further and further 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.