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Man Pages


Manual Reference Pages  -  PNG-BW (1)

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NAME

png-bw - convert a Portable Networks Graphics (PNG) format file to a BW format

CONTENTS

SYNOPSIS

png-bw [-ntsc] [-crt] [-R [num]] [-G [num]] [-B [num]] [in.png] > out.bw

DESCRIPTION

Pix-bw will convert a PNG format file from its standard input and produce a black and white bw(5) file on its standard output, If the PNG file contains a B/W image the conversion is direct, however, if the PNG file contains a color image, then by default all three colors are weighted equally. The -ntsc uses weighting based on the NTSC primaries and the D6500 alignment white. The -crt flag applies weights for "typical" CRT phosphor chromaticities and the D6500 white.

Individual color plane(s) can be selected via the -R -G and -B flags. If one or more of these flags is followed by a value, the value will be treated as a weight to be applied to that color This value is implicitly 1.0 divided by the number of colors selected for the flags which are not followed by a value.

EXAMPLES

png-bw -R -B < file.png > file.bw will equally blend the red and blue color planes.

png-bw bw_file.png < file.bw will convert a b/w PNG file to bw(5) format.

png-bw -R0.30 -G0.59 -B0.11 < file.png > file.bw has the same effect as the -ntsc flag. [The -crt weights are: 0.26, 0.66, 0.08]

SEE ALSO

brlcad(1), png-pix(1), bw-png(1), pix-png(1), pix(5), bw(5).

AUTHOR

John R. Anderson

COPYRIGHT

This software is Copyright (c) 1998-2013 by the United States Government as represented by U.S. Army Research Laboratory.

BUG REPORTS

Reports of bugs or problems should be submitted via electronic mail to <devs@brlcad.org>.

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BRL-CAD PNG-BW (1) 04/04/2016

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