PIXBACKGND(1)

NAME
pixbackgnd - generate a pix(5) shaded background

SYNOPSIS

pixbackgnd [-H] [-i] [-s squaresize] [-w width] [-n height] [-t title_height] [-a top_inten] [-b bottom_inten] hue saturation > file.pix

pixbackgnd [-H] [-i] [-s squaresize] [-w width] [-n height] [-t title_height] red green blue > file.pix

DESCRIPTION

pixbackgnd generates a pix(5) format shaded background on stdout suitable for making slides for a presentation on. The upper portion of the screen is reserved for a title area, and is drawn at constant intensity 240, followed by a 4 scanline white bar, after which the intensity smoothly decreases from 240 to 50. The values of hue and saturation range from 0 to 255 inclusive and can be selected via fbcolor(1). A hue of 160 is a pleasing blue.

The -a and -b options can be used to set the top and bottom intensity, in the range of 0 to 255. By default, the top intensity is 240, and the bottom is 50 (these values are used above).

-w and -n options set the width and height, respectively; -s sets them to the same value. By default, the display is assumed to be 512x512 pixels; specifying the -H flag, in addition to changing the title height to 90 scanlines (see below), changes the output size to 1024x1024.

By default, the title height is 80 scanlines, or 90 scanlines if the -H flag is set, but the -t title_height option may be used to specify another value. If title_height is set to zero, then the white bar is omitted as well, and the entire display is smoothly shaded.

If the -i flag is specified, the scanlines will be written out in inverted order (i.e., top to bottom).

EXAMPLES

pixbackgnd 160 200 | pixmerge fg.pix - | pix-fb

pixbackgnd -t120 160 250

pixbackgnd -i -t0 160 200 | pix-fb

SEE ALSO

brlcad(1), fbcolor(1), pix-fb(1), pixmerge(1)

BUGS

The starting and ending intensities should probably be an option.

AUTHOR

BRL-CAD Team

COPYRIGHT

This software is Copyright (c) 1989-2023 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