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INTRO(9)                   Kernel Developer's Manual                  INTRO(9)

       intro - introduction to raster image software

       Plan  9 provides a suite of commands and library routines to create and
       manipulate files containing gray-scale and full-color images.   Section
       9  of  this  manual  is divided into subsections numbered like the main
       manual sections:  9.1 for commands, 9.2 for library routines,  9.6  for
       file formats.

       Picture  files  are two-dimensional arrays of multi-byte records with a
       textual header describing the dimensions of the  image,  the  algorithm
       used  to  encode  the file, and whatever other information programs may
       wish to preserve.  Picfile(9.6) describes the file format; picopen(9.2)
       describes a library of routines to read and write picture files.

       /bin/fb contains a collection of programs to manipulate picture files.

       9v  displays  a picture file in an 8(1) window.  Examine similarly dis-
       plays an image and allows interactive examination of its pixel  values.
       Picinfo  displays  the header of a picture file on its standard output.
       Pcp copies picture files, modifying header attributes as requested  and
       updating the encoded picture array correspondingly.  It can clip a sub-
       window out of a picture, permute, delete, and rename  channels,  change
       the  encoding type and even convert full-color images to monochrome and
       vice-versa.  Hed is a more brute-force version of pcp that can apply an
       arbitrary sed(1) script to a picfile header.  It copies the image array
       verbatim and can thus convert precious images  into  garbage  or  vice-

       Dumppic,  gif2pic, picopic, and face2pic convert files in various alien
       formats to picfile(9.6) format.  Pic2ps converts picfiles  to  encapsu-
       lated  PostScript.  Nohed removes the header from a picture file.  When
       applied to a TYPE=dump picture this converts  it  into  the  ubiquitous
       `raw  dump' format.  Mugs is an interactive program to convert picfiles
       into 48x48 icons of the sort used by seemail (see mail(1) and face(6)).

       Some commands create simple images out of whole cloth.  Card writes  an
       image  of  constant  color.  Ramp creates an image that is one color at
       one edge and changes linearly to another color at the opposite edge.

       Aplot reads a square array of data points  and  draws  an  anti-aliased
       perspective plot of the surface it defines.

       There  are  numerous  commands that read one or more images and write a
       modified image  on  standard  output.   See  remap(9.1),  filters(9.1),
       floyd(9.1),  he(9.1),  lam(9.1),  lerp(9.1), logo(9.1), lum(9.1), quan-
       tize(9.1), resample(9.1), transpose(9.1), and xpand(9.1)  for  descrip-

       Moto  is  an animator's command language.  It converts concise descrip-
       tions of simultaneous processes overlapping  in  time  into  sequential
       command files suitable for producing frames of an animation.

       Tom Duff, ``Raster Graphics in Plan 9''
       Sections  add(2),  balloc(2),  cachechars(2),  subfalloc(2), bitblt(2),
       event(2), frame(2), print(2), bit(3), layer(2), bitmap(6), and  font(6)
       describe the standard Plan 9 interactive bitmap graphics interface.