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Short:PPM to Videotex (Teletext/Viewdata)
Author:chris at (Chris Young)
Uploader:chris unsatisfactorysoftware co uk
Architecture:ppc-amigaos >= 4.0.0 ; m68k-amigaos
Download: - View contents
AppName:     ppmtovtx
FileName:    ppmtovtx.lha
SDKVersion:  1.1,1.2
Publisher:   Unsatisfactory Software

ppmtovtx converts pictures into Videotex (CEPT-3) format.  The Videotex format
is shared with Teletext (Level 1) services such as Ceefax, and Viewdata
services such as Prestel or Minitel.

A Videotex frame is made up of 24 rows of 40 characters.  These characters can
be either printable ASCII characters, mosaic graphics or formatting commands.
The format allows for 8 colours including black, and a graphics resolution of
80x72.  Typically the first row on a Videotex service is a header row showing
the page number and service name, so the actual useable height is reduced to
23 rows, or 69 mosaic pixels.

ppmtovtx expects binary PPM files with a width of 80 pixels.  The height can
be anything up to 72 pixels, and should be divisible by three.  The behaviour
of the program in other cases is undocumented.  The usual height would be 69
pixels, which gives 23 rows of Videotex data.  You can scale pictures to this
size using the following command:

pnmscale -xsize 80 -ysize 69 picture.ppm >scaledpicture.ppm

Where "picture.ppm" is the name of the original file, and "scaledpicture.ppm" is
the destination (NB: the ">" is required).  pnmscale and tools to convert to and
from PPM format files are available in the NetPBM package. (NetPBM is available
from and an Amiga port is on Aminet)

You can then convert this into a Videotex frame using:

ppmtovtx scaledpicture.ppm scaledpicture.bin

Where "scaledpicture.ppm" is the input file, and "scaledpicture.bin" is the
output file in raw data format.

There are more options for ppmtocept3:

ppmtovtx <input file> <output file> [options [threshold]]

The output filename should end in ".bin" for a raw format file, or anything
else for an ESC coded file.  The ESC coded files (which I call .vtx format)
can be loaded by PstView amongst others, but .bin format is more widely used.

Options are one or more of {SHAKRGYBMCW} (case sensitive), as follows:

S - Separate mode
    Separates the mosaic graphics pixels.

H - Held graphics mode
    During colour changes the block with the colour change will be a
    duplicate of the previous block.  Probably not very useful.

A - Automatic background colour changes
    Changes the background colour to improve the colour resolution of the

D - Disable black foreground     Prevents ppmtovtx using the code for black
foreground colour (more compatible)
    Only works with "A" mode enabled.

K - Black background (default)
R - Red background
G - Green background
Y - Yellow background
B - Blue background
M - Magenta background
C - Cyan background
W - White background

It makes no sense to specify more than one of {AKRGYBMCW}.  Later colours
override earlier ones, and in conjunction with A at most only the start of the
first row will be of the specified colour.


1.3a (re-release)
* Added OS4 port, no other changes.

* I have absolutely no idea.

1.2 (23.03.2002)
* Added an option to prevent ppmtovtx inserting a code for black foreground
  Black foreground is not officially supported.  ppmtovtx will use a workaround

* Defaulted output to use .bin format if an extension was not recognised, rather
than .vtx

1.1 (16.03.2002)
* Fixed a bug where full foreground colour blocks would sometimes be in the
  background colour

* Fixed another bug which caused some of the picture to be in the background
colour   thus not being visible.

1.0 (07.01.2002)
* First release

Additional notes for included executables:

Copy the file Amiga/ppmtovtx or Amiga/ppmtovtx.os4 (for OS4 users) to
somewhere in your path (eg. SYS:C)
You should increase the stack before running this program (issue the
command "STACK 50000")
There seems to be a bug which occasionally causes a Suspend/Reboot requester
when the program exits (if you run it more than once) that I haven't managed to
track down.
OS4 users might be interested in the Videotex Datatype to view the output. See

Copy the file DOS/PPMTOVTX.EXE to somewhere in your path (usually
The compiler I used seems to have caused a bug when writing .bin format data -
occasionally the output includes a code for red text.  I advise recompiling
from the source code if at all possible.

Copy the contents of the intent directory to the root of the intent filesystem
(usually c:\intent)
No known bugs in this version.

These executable files and source code (in ANSI C) can be freely distributed
provided no money changes hands (excluding reasonable costs for media or
delivery) and the author is acknowledged and this .readme file is included with
the distribution.  The executable MUST NOT be distributed without the source
code, although it is permitted to distribute the source code without any
compiled binaries.  Modified binaries and source code MUST NOT be distributed
without reasonable contact details for the person who modified them (eg email
The author does not accept any responsibility for loss of data or other events
arising from the use of this software.  All use is at your own risk.  Any
changes made by third parties are their responsibility and not that of the
original author.
The original author retains copyright for the original source and any binary
created using that source code.  Although unlikely, permission to distribute or
use this source code or a resulting executable can be revoked at any time and
without warning.  This licence covers both commercial and non-commercial use. 
If you do not agree with these terms you must immediately delete this software

-- Chris Young, 13th January 2002

Version: 2.6.3in


Contents of gfx/pbm/ppmtovtx.lha
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 1776    2680  66.3% -lh5- b9d0 Nov 12 19:43
[generic]                 1464    2086  70.2% -lh5- 2e87 Mar 21  2005 ppmtovtx/
[generic]                15485   33160  46.7% -lh5- 4e7f Aug  1  2002 ppmtovtx/Amiga/ppmtovtx
[generic]                 4679    8768  53.4% -lh5- b14c Mar 21  2005 ppmtovtx/Amiga/ppmtovtx.os4
[generic]                 2807    7200  39.0% -lh5- 1915 Aug  1  2002 ppmtovtx/DOS/PPMTOVTX.EXE
[generic]                 2106    5552  37.9% -lh5- a789 Aug  1  2002 ppmtovtx/intent/app/stdio/ppmtovtx.00
[generic]                 2546    9060  28.1% -lh5- d1b2 Aug  1  2002 ppmtovtx/PPMTOVTX.C
[generic]                 2101    4076  51.5% -lh5- d5bc Mar 21  2005 ppmtovtx/
[generic]                 2863    6443  44.4% -lh5- 8dc3 Nov 12 19:50 ppmtovtx/ppmtovtx.readme
[generic]                 2685    4428  60.6% -lh5- c9bc Nov 12 19:44 ppmtovtx/
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        10 files   38512   83453  46.1%            Nov 13 07:33

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