INTRO(9)                                                 INTRO(9)

     NAME
          intro - introduction to raster image software

     DESCRIPTION
          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 the 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 pic-
          ture files.

          Drop displays a picture file in an 8½(1) window or on a raw
          Plan 9 terminal.  Examine similarly displays an image and
          allows interactive examination of its pixel values.  Picinfo
          displays the header of a picture file on its standard out-
          put.  Pcp copies picture files, modifying header attributes
          as requested and updating the encoded picture array corre-
          spondingly.  It can clip a subwindow out of a picture, per-
          mute, 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 pre-
          cious images into garbage or vice-versa.

          Dumppic, gif2pic, picopic and Face2pic convert files in var-
          ious alien formats to picfile(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' for-
          mat.  Mugs is an interactive program to convert picfiles
          into 48x48 icons of the sort used by seemail (see mail(1)).

          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.

          Twb and its subroutine dpic convert troff(1) input into
          anti-aliased images.

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     INTRO(9)                                                 INTRO(9)

          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 descriptions.

          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.

     SEE ALSO
          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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