GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
PIXFILTER(1) BRL-CAD PIXFILTER(1)

pixfilter - apply a 3x3 filter to a color pix file

pixfilter [-f type] [-v] [-d div] [-o offset] [-w width] [-n height] [-s squaresize] [file.pix] > newfile.pix

pixfilter applies one of several 3x3 kernel filters to a color pix(5) format file. It will take a file name or else read from standard input. The input file size will be assumed to be 512 by 512 pixels unless the -w, and/or -n, or the -s flags are used to tell it otherwise. By default a low pass filter is used. The -f type flag can be used to specify a different type of filter.

The type choices include:

lo

low pass (the default)

hi

high pass

vg

vertical gradient

hg

horizontal gradient

la

laplacian

b

boxcar low pass

Most filters divide the result of the kernel multiplication by some value in order to scale it back to a 0->255 range. For example, the boxcar divides by nine. The -d flag can be used to change this divisor. Some filters also add an offset to their results. The output of a laplacian for example is "centered" about zero, thus it adds 128 to the answer to yield a difference from neutral grey. The -o flag can be used to change this offset.

The -v flag displays the kernel values on standard error.

brlcad(1), pixscale(1), pix(5)

This should allow any 3x3 kernel to be specified.

BRL-CAD Team

This software is Copyright (c) 1989-2019 by the United States Government as represented by U.S. Army Research Laboratory.

Reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org
06/07/2022 BRL-CAD

Search for    or go to Top of page |  Section 1 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.