ppmfade Man page

PPMFADE(1) General Commands Manual PPMFADE(1)

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 transi‐
tion.

-shift The pixels in the first image will be shifted further and fur‐
ther 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.

1 April 1, 2000 PPMFADE(1)

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