ppmtopcx



Ppmtopcx User Manual(0)                                Ppmtopcx User Manual(0)




NAME

       ppmtopcx - convert a PPM image to a PCX file



SYNOPSIS

       ppmtopcx

       [-24bit]

       [-8bit]

       [-packed]

       [-stdpalette]

       [-palette=palettefile]

       [-planes=planes]

       [-xpos=cols]

       [-ypos=rows]

       [ppmfile]



DESCRIPTION

       This program is part of Netpbm(1).

       ppmtopcx  reads a PPM image as input and produces a PCX file as output.
       The type of the PCX file depends on the number of colors in the pixmap:



       16 colors or fewer:
              1 bit/pixel, 1-4 planes.


       more than 16 colors, but no more than 256:
              8 bits/pixel, 1 plane, colormap at the end of the file.


       More than 256 colors:
              24bit truecolor file (8 bits/pixel, 3 planes).



       You can override some of that and explicitly choose the format with the
       options below.




OPTIONS

       -24bit Produce a 24bit truecolor PCX file, even if the  image  has  256
              colors or fewer.


       -8bit  Produce  an 8bit (256 colors) PCX file, even if the image has 16
              colors or fewer.

              This option was added in Netpbm 10.18 (August 2003).


       -packed
              Use ’packed pixel’ format for files with 16 colors or fewer:  1,
              2, or 4 bits/pixel, 1 plane.


       -stdpalette
              Instead of computing a palette from the colors in the image, use
              a standard, built-in 16 color palette.  If the image contains  a
              color that is not in the standard palette, ppmtopcx fails.

              The standard palette is not only a set of colors, but a specific
              mapping of palette indexes to colors.  E.g. red is 4.

              You can use pnmremap with a suitable PPM image of  the  standard
              palette  to  adapt your image to use exactly those colors in the
              palette so that ppmtopcx -stdpalette will work on it.

              The file pcxstd.ppm,  part  of  Netpbm,  contains  the  standard
              palette.

              Although  the  PCX  header tells exactly what palette is used in
              the file, some older PCX interpreters do not use  that  informa-
              tion.   They  instead assume the standard palette.  If you don’t
              use the -stdpalette option, ppmtopcx,  ppmtopcx  may  create  an
              image that uses a different palette (a rearrangement of the same
              colors) and then one of these older interpreters would interpret
              the colors in the image wrong.

              You cannot specify this option along with -palette.

              This option was new in Netpbm 10.22 (April 2004).


       -palette=palettefile
              Instead  of  computing the palette from the colors in the image,
              use the palette from the file palettefile.  If the palette  con-
              tains a color that is not in that palette, ppmtopcx fails.

              The palette file must be a PPM image that contains one pixel for
              each color in the palette.  It doesn’t matter  what  the  aspect
              ratio  of  the palette image is.  The order of the colors in the
              PCX palette is the order of the pixels in the PPM image in stan-
              dard  western  reading order (left to right, top to bottom).  If
              there is a duplicate color  in  the  palette,  ppmtopcx  chooses
              between them arbitrarily in building the PCX raster.

              You  would  need  this  only if you have a PCX reader that can’t
              read the palette that is in the PCX  file  and  instead  assumes
              some particular palette.  See also the -stdpalette option.

              If  your  input  image  might contain colors other than those in
              your palette, you can convert the input image to one  that  con-
              tains only those colors in your palette with pnmremap.

              You cannot specify this along with -stdpalette.

              This option was new in Netpbhm 10.25 (October 2004).


       -planes=planes
              Generate  a  PCX file with planes planes, even though the number
              of colors in the image could  be  represented  in  fewer.   This
              makes  the file larger, but some PCX interpreters are capable of
              processing only certain numbers of planes.

              This is meaningful only when ppmtopcx generates an image in  the
              16  color  palette  format without packed pixels.  Consequently,
              you cannot specify this option together with -24bit or -8bit  or
              -packed.

              The  valid  values  for  planes are 1, 2, 3, and 4.  By default,
              ppmtopcx chooses the smallest number of planes that  can  repre-
              sent  the colors in the image.  E.g. if there are 5 colors, ppm-
              topcx chooses 3 planes.

              This option was new in Netpbm 10.21 (March 2004).


       -xpos=cols


       -ypos=rows
               These options set the position of the image in some field (e.g.
              on  a  screen) in columns to the right of the left edge and rows
              below the top edge.  The  PCX  format  contains  image  position
              information.  Don’t confuse this with the position of an area of
              interest within the image.  For example, using pnmpad to  add  a
              10  pixel left border to an image and then converting that image
              to PCX with xpos = 0 is not the same as converting the  original
              image to PCX and setting xpos = 10.

              The values may be from -32767 to 32768.

              The default for each is zero.






SEE ALSO

       pcxtoppm(1), ppm(1)



AUTHORS

       Copyright  (C)  1994  by Ingo Wilken (Ingo.Wilken@informatik.uni-olden-
       burg.de)

       Based on previous work by Michael Davidson.



netpbm documentation             27 March 2004         Ppmtopcx User Manual(0)

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