10-14-2012
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
i.e configuration of C compiler :confused: (4 Replies)
Discussion started by: atiato
4 Replies
2. Programming
Hi
I was trying to open a file with french name on Mac OS-X with open() and fopen() but it didn't work.Do we have any POSIX unix func. which can be used to open any file with special name.
if anybody has an idea plz help.
Thanks
Mohit (1 Reply)
Discussion started by: mohit grover
1 Replies
3. Programming
hello..
i make some code with C in freebsd 5.4 and compile it in solaris
somehow i succeed compile the program.
but when i run it, i got error message "Broken Pipe"
i looked out the syntax that that caused this,
fp = fopen("file.tmp","r");
does anyone know why, and how to solve this... (3 Replies)
Discussion started by: kuampang
3 Replies
4. Programming
For reading in large text files (say files over 1kB in size) are there any issues with fopen() that I should be aware of ?
cheers (2 Replies)
Discussion started by: JamesGoh
2 Replies
5. Web Development
Dear all,
I'm a newbie for PHP and TCPDF ,I have to change the URL to PDF, so I used FPDF , But it cannot convert most of the advanced HTML tags. So explored again and found TCPDF , it can do most of the tag but I cannot found to change URL to PDF. So Does anyone can point the example... (0 Replies)
Discussion started by: athae
0 Replies
6. UNIX for Advanced & Expert Users
Hello!
I'm having problems with fopen() call in Linux.
I have shared library (created by myself) that implements some file operations:
int lib_func(char* file_name) {
...
fd = fopen(file_name, "r");
if(!fd) {... exit with error ...}
...
do something useful using fd
...
... (2 Replies)
Discussion started by: kalbi
2 Replies
7. Programming
what is the difference between
fopen and open
fread and read
fwrite and write
open and create
why this much of functions for the i/o when everything does the same...?
What is their major difference?
In which case, which is the best to use.
:confused:'ed Collins (2 Replies)
Discussion started by: collins
2 Replies
8. Programming
This code works fine when I use a command line argument for fopen()'s parameter, but when I change it to a filename, the program freezes upon compilation. input.txt is definitely there, so I can't figure it out. Thanks.
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
int... (3 Replies)
Discussion started by: lazypeterson
3 Replies
9. Programming
I always assumed the fopen/freopen is very costly, so when I needed to work with many files within on process I spent extra time to implement a list of FILE * pointers to avoid extra open/reopen but it did not produced any better results.
Here is a task at hand - there is a huge stream of data... (4 Replies)
Discussion started by: migurus
4 Replies
10. Programming
Hi All,
Although this code is quite long but it does not require one to understand the logic of the code. I am trying to run this code on my Linux machine using gcc. But when this line is executed:
output_pointer = fopen ( file_name , "w" );I get segmentation fault. I've been breaking my head... (17 Replies)
Discussion started by: shoaibjameel123
17 Replies
LEARN ABOUT OPENSOLARIS
pbmreduce
pbmreduce(1) General Commands Manual pbmreduce(1)
NAME
pbmreduce - read a portable bitmap and reduce it N times
SYNOPSIS
pbmreduce [-floyd|-fs|-threshold ] [-value val] N [pbmfile]
DESCRIPTION
Reads a portable bitmap as input. Reduces it by a factor of N, and produces a portable bitmap as output.
pbmreduce duplicates a lot of the functionality of pgmtopbm; you could do something like pnmscale | pgmtopbm, but pbmreduce is a lot
faster.
pbmreduce can be used to "re-halftone" an image. Let's say you have a scanner that only produces black&white, not grayscale, and it does a
terrible job of halftoning (most b&w scanners fit this description). One way to fix the halftoning is to scan at the highest possible res-
olution, say 300 dpi, and then reduce by a factor of three or so using pbmreduce. You can even correct the brightness of an image, by
using the -value flag.
OPTIONS
By default, the halftoning after the reduction is done via boustrophedonic Floyd-Steinberg error diffusion; however, the -threshold flag
can be used to specify simple thresholding. This gives better results when reducing line drawings.
The -value flag alters the thresholding value for all quantizations. It should be a real number between 0 and 1. Above 0.5 means darker
images; below 0.5 means lighter.
All flags can be abbreviated to their shortest unique prefix.
SEE ALSO
pnmenlarge(1), pnmscale(1), pgmtopbm(1), pbm(5)
AUTHOR
Copyright (C) 1988 by Jef Poskanzer.
02 August 1989 pbmreduce(1)