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INTRO(9)										 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 what-
       ever 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 81/2(1) window.  Examine similarly displays an image and
       allows interactive examination of its pixel values.  Picinfo displays the header of a pic-
       ture  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 pic-
       file(9.6) format.  Pic2ps converts picfiles to encapsulated 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), quantize(9.1),  resample(9.1),  transpose(9.1),  and  xpand(9.1)  for

       Moto  is an animator's command language.  It converts concise descriptions 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  interac-
       tive bitmap graphics interface.

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