Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

RedHat 9 (Linux i386) - man page for ppmtopgm (redhat section 1)

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

ppmtopgm - convert a portable pixmap into a portable graymap
ppmtopgm [ppmfile]
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b. Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original colors, not necessarily a way that looks like a black and white photograph.
Cold-hearted orb that rules the night Removes the colors from our sight Red is gray, and yellow white But we decide which is right And which is a quantization error.
Copyright (C) 1989 by Jef Poskanzer. 10 April 2000 ppmtopgm(1)

Ubuntu is a free, open-source Linux distribution based on Debian Linux; and Ubuntu is named after the African philosophy of ubuntu, which Canonical translates as "humanity to others" or "I am what I am because of who we all are". Ubuntu is developed by Canonical and the community under a "meritocratic" governance model. Canonical provides security updates and support for each Ubuntu release, starting from the release date and until the release reaches its designated end-of-life (EOL) date. Canonical generates revenue through the sale of premium services associated with Ubuntu. Ubuntu is generally released to the public in three editions: Desktop, Server, and Core (for IoT devices and robots). Ubuntu is a popular operating system for cloud computing and supports OpenStack. Ubuntu is released every six months with long-term support (LTS) releases every two years.
Please enjoy and help our forum community by "showing your work" and posting your code, even when your code is not working as expected. To help others help you, please wrap your code blocks, sample input, sample output, error messages, and other data in CODE tags and wrap your short commands and short data objects in ICODE tags. We were all beginners in the beginning. If you have any questions about how to register or how to post, please contact us in Live Chat. Thank you and enjoy this "forever free" technical support community for UNIX, Linux and computer information technology in general.