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.