Man1 - ppmtoarbtxt.1

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
- gray inversion
- povray file
SEE ALSO
HISTORY
AUTHOR

NAME

ppmtoarbtxt - generate image in arbitrary text format from PPM image

SYNOPSIS

ppmtoarbtxt bodyskl [*-hd* /headskl/] [*-tl* /tailskl/] [/ppmfile/]

DESCRIPTION

This program is part of *Netpbm*(1)

ppmtoarbtxt generates simple text-based graphics formats based on format 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 certain 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
      }
    }
  }

HISTORY

ppmtoarbtxt was added to Netpbm in Release 10.14 (March 2003). It existed under the name ppmtotxt since 1995.