pnmdepth(1) General Commands Manual pnmdepth(1)NAME
pnmdepth - change the maxval in a portable anymap
SYNOPSIS
pnmdepth newmaxval [pnmfile]
DESCRIPTION
Reads a portable anymap as input. Scales all the pixel values, and writes out the image with the new maxval. Scaling the colors down to a
smaller maxval will result in some loss of information.
Be careful of off-by-one errors when choosing the new maxval. For instance, if you want the color values to be five bits wide, use a max-
val of 31, not 32.
One important use of pnmdepth is to convert a new format 2-byte-per-sample PNM file to the older 1-byte-per-sample format. Before April
2000, essentially all raw (binary) format PNM files had a maxval less than 256 and one byte per sample, and many programs may rely on that.
If you specify a newmaxval less than 256, the resulting file should be readable by any program that worked with PNM files before April
2000.
SEE ALSO pnm(5), ppmquant(1), ppmdither(1)AUTHOR
Copyright (C) 1989, 1991 by Jef Poskanzer.
08 April 2000 pnmdepth(1)
Check Out this Related Man Page
pgmedge(1) General Commands Manual pgmedge(1)NAME
pgmedge - edge-detect a portable graymap
SYNOPSIS
pgmedge [pgmfile]
DESCRIPTION
Reads a portable graymap as input. Outlines the edges, and writes a portable graymap as output. Piping the result through pgmtopbm
-threshold and playing with the threshold value will give a bitmap of the edges.
The edge detection technique used is to take the Pythagorean sum of two Sobel gradient operators at 90 degrees to each other. For more
details see "Digital Image Processing" by Gonzalez and Wintz, chapter 7.
The maxval of the output is the same as the maxval of the input The effect is better with larger maxvals, so you may want to increase the
maxval of the input by running it through pnmdepth first.
SEE ALSO pgmenhance(1), pgmtopbm(1), pnmdepth(1), pgm(5), pbm(5)AUTHOR
Copyright (C) 1991 by Jef Poskanzer.
04 February 1990 pgmedge(1)
Manufacturer Links
General Information
Home Page: IBM United States
Documentation/Information: IBM System p - UNIX servers: Support and services
pSeries and AIX Information Center
Developerworks AIX Wiki: AIX Wiki
AIX for System Administrators
In-depth information from IBM:
IBM... (0 Replies)
Not sure if anyone is interested but I am just getting into UNIX like shell scripting...
I have great interest in pseudo-animations in text mode and accessing HW like /dev/dsp for example...
...
Have fun, I do... ;o)
# !/bin/sh
#
# Bargraph_Generator.sh
#
# A DEMO 6 bit coloured... (0 Replies)
For a starter I know the braces are NOT in the code...
Consider these code snippets:-
#!/bin/bash --posix
x=0
somefunction()
if
then
echo "I am here."
fi
# somefunction
#!/bin/bash --posix
x=0
somefunction()
if (2 Replies)
For those interested in installing dash shell on OSX Lion to help test POSIX compliancy of shell scripts, it is quite easy. I did it like this:
If you don't have gcc on your system:
0. Download and install the Command Line Tools for Xcode package from Sign In - Apple *
1. Download the dash... (2 Replies)
Hearing Aid...
Hi folks yet another bizarre piece of code that is Apple OSX 10.12.x to at least 10.14.1 specific.
It requires only a default OSX install, and the internal microphone along with an external headphone assembly.
Pre-amble, 14-02-2019:
For over 3 weeks now I have been suffering a... (3 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)
Greetings,
I'm trying to delete a file with a weird name from within Terminal on a Mac.
It's a very old file (1992) with null characters in the name: ââWord FinderÂŽ Plusâ˘.
Here are some examples of what I've tried:
12FX009:5 dpontius$ ls
ââWord FinderÂŽ Plusâ˘
12FX009:5 dpontius$ rm... (29 Replies)
I have to print the number of stars that increases on each line from the minimum number until it reaches the maximum number, and then decreases until it goes back to the minimum number. After printing out the lines of stars, it should also print the total number of stars printed.
I have tried... (13 Replies)
Hi all...
Well guys and gals, I jumped in at the deep end and found things that PERL cannot do by default.
Many tricky terminal escape codes are not catered for so I had to create workarounds.
One thing I searched for was this:
Passing perl variable to shell command
AND, @Neo this was... (15 Replies)
Well, guys I saw a question about GOTO for Python.
So this gave me the inspiration to attempt a GOTO function for 'dash', (bash and ksh too).
Machine: MBP OSX 10.14.3, default bash terminal, calling '#!/usr/local/bin/dash'...
This is purely a fun project to see if it is possible in PURE... (3 Replies)
I am sharing a code snippet.
for (( i=0; i<=$(( $count -1 )); i++ ))
do
first=${barr2}
search=${barr1}
echo $first
echo "loop begins"
for (( j=0; j<=5000; j++ ))
do
if } == $search ]]; then
echo $j
break;
fi
done
second=${harr2}
echo $second (2 Replies)
Hi All,
I'm having a python script: test.py in /path/to/script/test.py
I'm using a properties file: test_properties.py (it is having values as dictionary{}) which is in same DIR as the script.
Sample Properties file:
params = {
'target_db' : 'a1_db'
'src_db' : ... (15 Replies)