PPMFADE(1)PPMFADE(1)NAMEppmfade - generate a transition between two image files
using special effects.
SYNOPSISppmfade [ -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 fur
ther 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 fil
tered 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" ver
sion 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 ver
sion 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" ver
sion 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 ALSOtontsc(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)
