RGB_TO_BW(3)                                       RGB_TO_BW(3)





NAME
       rgb_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;

DESCRIPTION
       rgb_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 identi-
     cal to one of red, green, or blue.

SEE ALSO
       tobw(1), librle(3), RLE(5).

AUTHOR
       Spencer W. Thomas
       University of Utah



3                            2/2/87                RGB_TO_BW(3)
