pgmnoise(1) General Commands Manual pgmnoise(1)NAME
pgmnoise - create a graymap made up of white noise
pgmnoise width height
Creates a portable graymap that is made up of random pixels with gray values in the range of 0 to PGM_MAXMAXVAL (depends on the compila-
tion, either 255 or 65535). The graymap has a size of width * height pixels.
SEE ALSO pgm(5)AUTHOR
Copyright (C) 1993 by Frank Neumann
16 November 1993 pgmnoise(1)
Check Out this Related Man Page
asciitopgm(1) General Commands Manual asciitopgm(1)NAME
asciitopgm - convert ASCII graphics into a portable graymap
asciitopgm [-d divisor] height width [asciifile]
Reads ASCII data as input. Produces a portable graymap with pixel values which are an approximation of the "brightness" of the ASCII char-
acters, assuming black-on-white printing. In other words, a capital M is very dark, a period is ver light, and a space is white. Input
lines which are fewer than width characters are automatically padded with spaces.
The divisor argument is a floating-point number by which the output pixels are divided; the default value is 1.0. This can be used to
adjust the brightness of the graymap: for example, if the image is too dim, reduce the divisor.
In keeping with (I believe) Fortran line-printer conventions, input lines beginning with a + (plus) character are assumed to "overstrike"
the previous line, allowing a larger range of gray values.
This tool contradicts the message in the pbmtoascii manual: "Note that there is no asciitopbm tool - this transformation is one-way."
The table of ASCII-to-grey values is subject to interpretation, and, of course, depends on the typeface intended for the input.
SEE ALSO pbmtoascii(1), pgm(5)AUTHOR
Wilson H. Bent. Jr. (firstname.lastname@example.org)
26 December 1994 asciitopgm(1)
I need help!Many Thanks!
Now,I try to manage the shared memory inter-process .
Inevitably,I have to deal with the synchronous.
I know the pthread_rwlock in posix,and I compile ,then run successfully in Red Hat Enterprise 4.
I have a doubt about whether the Posix supports the system such as... (1 Reply)
I'm a user and a programmer of UNIX based systems (mainly FreeBSD and Linux).
I have never programmed or tried to fully understand the kernel layer. I haven't a special propouse for learning it, but I'd like to. Can anyone suggest me books, documentation or examples that may help me... (2 Replies)
I hope everybody is fine. I have been studing operating system concepts at college, and I find this subject very interesting. I've decided that I must go into this field no matter what, hopefully someday I would design my own operating system. I have two choices infront of me, studying... (9 Replies)
I am thinking of developing an app' for Android mobile devices...
Two questions here:-
1) Does anyone _develop_ for the Android _mobile_ platform?
If so do you use OSX 10.7.5 or greater as your _development_platform_?
2) I know ********* is gonna say that the Android terminal/shell is... (13 Replies)
I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX.
Ok onto business, my questions are-:
Was/Is UNIX ever an open source operating system ?
If UNIX was... (21 Replies)
I hope you are fine,
I'd like study Os I tried a book like Silberschatz it's a good book but like
other books it talks about the concepts abstractly and that's due to it try
to encompass many concepts from many operating systems in GENERAL.
i am not too much comfortable from these... (20 Replies)
I'm new on the site and do not write very well in English, I am now using osx platform and was attracted to her. For several searches on random websites for Unix content yours was the best and most interesting, I registered and already visualized some very interesting content. But I wonder where... (3 Replies)
I am new to this forum and this is my very first post, one i think i will look back at many years from now and have nothing to regret about.
This is simply because i recently installed Linux (Ubuntu) on my system and downloaded a book titled, The Unix Programming Environment. I... (7 Replies)
What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file.
# When the shell exits, append to the history file instead of overwriting it
shopt -s histappend (3 Replies)