Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

ppmrainbow(1)


NAME

   ppmrainbow - Generate a rainbow

SYNOPSIS

   ppmrainbow [-width=number] [-height=number]
   [-tmpdir=directory] [-verbose] color ...

   All  options  can  be abbreviated to their shortest unique prefix.  You
   may use two hyphens instead of one to designate an option.  You may use
   either  white  space  or  equals  signs  between an option name and its
   value.

DESCRIPTION

   ppmrainbow generates a PPM image that fades from one color  to  another
   to  another  from  left to right, like a rainbow.  The colors are those
   you specify on the command line, in that order.   The  first  color  is
   added again on the right end of the image.

   If  you want a vertical or other non-horizontal rainbow, run the output
   through pnmrotate.

   One use for such a rainbow is to compose it with another image under an
   alpha  mask  in order to add a rainbow area to another image.  In fact,
   you can make  rainbow-colored  text  by  using  pbmtext,  pnmcomp,  and
   ppmrainbow.

OPTIONS

   -width number
          The width in pixels of the output image.

          Default is 600.

   -height number
          The height in pixels of the output image.

          Default is 8.

   -tmpdir
          The  directory  specification  of the directory ppmrainbow is to
          use for temporary files.

          Default is the value of the TMPDIR environment variable, or /tmp
          if TMPDIR is not set.

   -verbose
          Print the "commands" (invocations of other Netpbm programs) that
          ppmrainbow uses to create the image.

SEE ALSO

   ppmmake(1), pnmcomp(1), pbmtext(1), ppmfade(1), ppm(5).

AUTHOR

   Arjen Bax wrote ppmrainbow in June  2001  and  contributed  it  to  the
   Netpbm package.  Bryan Henderson wrote this man page in July 2001.

                              1 July 2001                    ppmrainbow(1)



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.



Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.



Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.



Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner