RGB_TO_BW(3)RGB_TO_BW(3)NAMErgb_to_bw - convert a color scanline to black and white.
SYNOPSIS
#include <rle.h>
void rgb_to_bw( red, green, blue, bw, length );
rle_pixel * red, * green, * blue, *bw;
int length;
DESCRIPTIONrgb_to_bw converts red/green/blue color information to black and white
using the NTSC Y transform:
Y = 0.30 * R + 0.59 * G + 0.11 * B . The arguments point to scanlines
with length bytes in each. bw may be identical to one of red, green, or
blue.
SEE ALSOtobw(1), librle(3), RLE(5).
AUTHOR
Spencer W. Thomas
University of Utah
4th Berkeley Distribution 2/2/87 RGB_TO_BW(3)