Provided by: netpbm_10.0-15.3build1_amd64 
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.