Ppmtoarbtxt User Manual(0) Ppmtoarbtxt User Manual(0)NAMEppmtoarbtxt - generate image in arbitrary text format from PPM image
SYNOPSISppmtoarbtxt bodyskl [-hd headskl] [-tl tailskl] [ppmfile]
DESCRIPTION
This program is part of Netpbm(1).
ppmtoarbtxt generates simple text-based graphics formats based on for‐
mat descriptions given as input. A text-based graphics format is one
in which an image is represented by text (like PNM plain format, but
unlike PNM raw format).
ppmtoarbtxt reads a PPM image as input. For each pixel in the image,
ppmtoarbtxt writes the contents of the skeleton file bodyskl, with cer‐
tain substitutions based on the value of the pixel, to stdout. The
substitutions are as follows:
#(ired format blackref whiteref)
generates an integer in the range blackref to whiteref using
format representing the red intensity of the pixel. A red
intensity of 0 becomes blackref; a red intensity of maxval
becomes whiteref.
#(ired) is equivalent to #(ired %d 0 255).
#(igreen format blackref whiteref)
Same as #(ired..., but for green.
#(iblue format blackref whiteref)
Same as #(ired..., but for blue.
#(ilum format blackref whiteref)
Same as #(ired..., but representing the luminance value
(0.299*red + 0.587*green + 0.114*blue) of the pixel.
#(fred format blackref whiteref)
Same as #(ired..., but generates a floating point number instead
of an integer.
#(fred) is equivalent to #(fred %f 0.0 1.0).
#(fgreen format blackref whiteref)
Same as #(fred..., but for green.
#(fblue format blackref whiteref)
Same as #(fred..., but for blue.
#(flum format blackref whiteref)
Same as #(fred..., but representing the luminance value
(0.299*red + 0.587*green + 0.114*blue) of the pixel.
#(width)
Generates the width in pixels of the image.
#(height)
Generates the height in pixels of the image.
#(posx)
Generates the horizontal position of the pixel, in pixels from
the left edge of the image.
#(posy)
Generates the vertical position of the pixel, in pixels from the
top edge of the image.
If the skeleton file ends with a LF-character, ppmtoarbtxt ignores it
-- it does not include it in the output.
OPTIONS-hd headskl
This option causes ppmtoarbtxt to place the contents of the file
named headskl at the beginning of the output, before the first
pixel. It does the same substitutions as for bodyskl, except
substitutions based on a pixel value are undefined.
-tl tailskl
This option causes ppmtoarbtxt to place the contents of the file
named tailskl at the end of the output, after the last pixel.
It is analogous to -hd.
EXAMPLES
gray inversion
Here we generate a PGM plain-format image with gray inversion (like
ppmtopgm | pnminvert).
Contents of our head skeleton file:
P2
#(width) #(height)
255
Contents of our body skeleton file:
#(ilum %d 255 0)
povray file
Here we generate a povray file where each pixel is represented by a
sphere at location (x,y,z) = (posx,height-posy,luminance). The color
of the sphere is the color of the pixel.
Contents of our head skeleton:
#include 'colors.inc'
#include 'textures.inc'
camera {
location <#(width) * 0.6, #(height) * 0.7, 80>
look_at <#(width) * 0.5, #(height) * 0.5, 0>
}
light_source { <#(width) * 0.5, #(height) * 0.5, 25> color White
}
Contents of our body skeleton:
sphere { <#(posx),#(height)-#(posy),#(ilum %d 0 10)>, 0.5
texture {
pigment {
color rgb <#(fred),#(fgreen),#(fblue)>
}
finish {
phong 1
}
}
}
SEE ALSOpnmtoplainpnm(1)ppm(1)HISTORYppmtoarbtxt was added to Netpbm in Release 10.14 (March 2003). It
existed under the name ppmtotxt since 1995.
AUTHOR
Copyright (C) 1995 by Peter Kirchgessner
netpbm documentation 27 April 2003 Ppmtoarbtxt User Manual(0)
