Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

pgmenhance(1)


NAME

   pgmenhance - edge-enhance a portable graymap

SYNOPSIS

   pgmenhance [-N] [pgmfile]

DESCRIPTION

   Reads  a  portable  graymap as input.  Enhances the edges, and writes a
   portable graymap as output.

   The edge enhancing technique is taken from Philip R.  Thompson's  "xim"
   program,  which in turn took it from section 6 of "Digital Halftones by
   Dot Diffusion", D. E. Knuth, ACM Transaction on Graphics Vol. 6, No. 4,
   October 1987, which in turn got it from two 1976 papers by J. F. Jarvis
   et. al.

OPTIONS

   The optional -N flag should be a digit from 1 to 9.  1  is  the  lowest
   level of enhancement, 9 is the highest, The default is 9.

SEE ALSO

   pgmedge(1), pgm(5), pbm(5)

AUTHOR

   Copyright (C) 1989 by Jef Poskanzer.

                            13 January 1989                  pgmenhance(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