unsigned char *HSI_Values(unsigned char *inputbits, char inc, LONG
input_width, LONG input_height)
{
	static unsigned char *outputbits;
	long int i;
	static char start = 1;
	signed long int r, g, b, max, min, intensity, hue, saturation, temp;
	double angle;

	if (start)
	{
		outputbits =
		malloc(3*input_width*input_height*sizeof(unsigned char));
		start = 0;
	}

	for (i=0; i < (input_width*input_height*3); i+=3)
	{
		b = inputbits[i];
		g = inputbits[i+1];
		r = inputbits[i+2];

		max = Maximum(r,g,b);		/* compute Intensity */
		min = Minimum(r,g,b);
		intensity = (min + max) / 2;
		outputbits[i+2] = (unsigned char) intensity;

		if (max == min)				/* achromatic case */
		{
			outputbits[i] = 0;		// hue is undefined

			outputbits[i+1] = 0;	// saturation = 0

		}
		else if (intensity < 20)	/* too dark (ADDED) */
		{
			outputbits[i] = 0;		// hue is undefined

			outputbits[i+1] = 0;	// saturation = 0

		}
		else if (intensity > 235)	/* too bright (ADDED) */
		{
			outputbits[i] = 0;		// hue is undefined

			outputbits[i+1] = 0;	// saturation = 0

		}
		else		/* chromatic case */
		{
			if (intensity <= 127)	/* bottom cone (dark) */
				saturation = (255 * (max - min)) / (max + min);
			else	/* top cone (bright) */
				saturation = (255 * (max - min)) / 
						(512 - max - min);
			if ((saturation < 0) || (saturation > 255))
				OutputText("Problem with saturation\n");
			outputbits[i+1] = (unsigned char) saturation;


			if (r == max)
				hue = (60 *(g -b))/(max - min);
	/* color is between yellow and magenta */
			else if (g == max)
				hue = 60*2 + (60*(b-r))/(max-min);
	/* color is between cyan and yellow */
			else
				hue = 60*4 + (60*(r-g))/(max-min);	
	/* color is between magenta and cyan */
			if (hue < 0)
				hue = hue + 360;
			if ((hue < 0) || (hue > 360))
				OutputText("Problem with hue\n");
			temp = (255 * hue) / 360;
			outputbits[i] = (unsigned char) temp;
		}
	}
	return(outputbits);
}