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 ]
add an example, a script, a trick and tips
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.
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.
see also
tontsc,
sgifade, smart_vfr, xmorph,
ppm,
author
Wesley C.
Barris (wesb[:at:]msc[:dot:]edu)
Army High Performance Computing Research Center (AHPCRC)
Minnesota Supercomputer Center, Inc.