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Ppmfade User Manual(0)                                  Ppmfade User Manual(0)



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 is part of Netpbm(1).

       ppmfadegenerates  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 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 you don't specify
              this, 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 you don't specify
              this, 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 bright-
              ness 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 loca-
              tion 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  ver-
              sion of the last image.  The block version of the last image is then focused to the final image.


       -base name
              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 manual, sgifade manual, smart_vfr manual, xmorph manual, ppm(1)


AUTHOR
       Bryan Henderson, Olympia WA; April 2000

       Inspired by and intended as a replacement for pbmfade (not a Netpbm program) by Wesley C. Barris.



netpbm documentation             April 1, 2000          Ppmfade User Manual(0)