08-24-2006
8 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi. I have a few "newbie" questions. This is a 2 part question which I was unable to find an answer. First, I have recently installed the kernel patch and video driver from Nvidia for my GeForce Ti 4800 video card for 3d on a fresh install of Redhat 8.0. I need to do all of the updates for Redhat.... (1 Reply)
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2. UNIX for Dummies Questions & Answers
I was a sys admin on a HP3000. I was able to virtually move the console where ever I needed it for commands that had to be done at the master console. So I could be at home and perform some functions that you would usually have to do from the console. Now I am sys admin newbee on an AIX pseries.... (2 Replies)
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3. UNIX for Dummies Questions & Answers
Hello to all this is my first que pls ans it
What could happen if the Kernel would allow 2 processes 2 mount the same file system simultaneously at two mount points/ (0 Replies)
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4. AIX
Hi,
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5. AIX
Hi,
I want to know how to create nim master in AIX 5.3.
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6. Red Hat
I have a server running CentOS 5 and when yum update is run and a new kernel is installed and there are more then 3 kernels installed the oldest ones are removed. Anyway to achieve this with CentOS 4?
Matt (1 Reply)
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7. UNIX Desktop Questions & Answers
I have an application desigend in PHP and MySQl running on apache web server that I is running on a Amazon EC2 server Centos. I want to implement the master-master and master slave replication and high availability disaster recovery on this application database.
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8. UNIX for Beginners Questions & Answers
Hello Forum,
I'm using the following command to find all inactive kernels installed on my RHEL server:
$ rpm -qa | grep '^kernel-' |grep -vE `uname -r`
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LEARN ABOUT ULTRIX
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)