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RGB_TO_BW(3) FreeBSD Library Functions Manual RGB_TO_BW(3)

rgb_to_bw - convert a color scanline to black and white.

#include <rle.h>

void rgb_to_bw( red, green, blue, bw, length );
rle_pixel * red, * green, * blue, *bw;
int length;

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 identical to one of red, green, or blue.

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

Spencer W. Thomas
University of Utah
2/2/87 4th Berkeley Distribution

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