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.

1                                                 April 1, 2000                                       PPMFADE(1)