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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
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