| Linux / Unix Command: ppmshadow |
NAME
ppmshadow - add simulated shadows to a portable pixmap imageSYNOPSIS
ppmshadow [-b blur_size] [-k] [-t] [-x xoffset] [-y yoffset] [-u] [pnmfile]DESCRIPTION
ppmshadow adds a simulated shadow to an image, giving the appearance that the contents of the image float above the page, casting a diffuse shadow on the background. Shadows can either be black, as cast by opaque objects, or translucent, where the shadow takes on the colour of the object which casts it. You can specify the extent of the shadow and its displacement from the image with command line options.OPTIONS
- -b blur_size
-
Sets the distance of the light source from the image. Larger values move the light source closer, casting a more diffuse shadow, while smaller settings move the light further away, yielding a sharper shadow. blur_size defaults to 11 pixels.
- -k
-
Keep the intermediate temporary image files. When debugging, these
intermediate files provide many clues as to the source of an error.
See
FILES
below for a list of the contents of each file.
- -t
-
Consider the non-background material in the image translucent -- it
casts shadows of its own colour rather than a black shadow, which is
default. This often results in fuzzy, difficult-to-read images but in
some circumstances may look better.
- -u
-
Print command syntax and a summary of options.
- -x xoffset
-
Specifies the displacement of the light source to the left of the
image. Larger settings of
xoffset
displace the shadow to the right, as would be cast by a light further
to the left. If not specified, the horizontal offset is half of
blur_size
(above), to the left.
- -y yoffset
-
Specifies the displacement of
the light source
above the top of the image. Larger settings
displace the shadow downward, corresponding to
moving the light further above the top of the image.
If you don't specify
-y,
the vertical offset defaults to the same as the horizontal offset (above),
upward.
SEE ALSO
pnm(5), pnmmargin(1), pnmconvol(1), pnmscale(1), pnmsmooth(1), ppm(5)Important: Use the man command (% man) to see how a command is used on your particular computer.
