ppmfade - generate a transition between two image files using
special effects.
ppmfade [ -f first.ppm ] [ -l
last.ppm ] [
-mix|-spread|-shift|-relief|-oil|-edge|-bentley|-block
] [ -base name ]
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.
- -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.
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.
Wesley C. Barris (wesb@msc.edu)
Army High Performance Computing Research Center (AHPCRC)
Minnesota Supercomputer Center, Inc.