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How can I efficiently convert RGB to HSV and vice versa within the 0-255 range?
How can I efficiently convert RGB to HSV and vice versa within the 0-255 range?
Jan 01, 2025 am 02:06 AM
Converting RGB to HSV and Vice Versa in the Range 0-255: Practical Code Solutions
Problem:
In various image processing applications, it often becomes necessary to convert colors between the RGB and HSV color spaces. To ensure seamless transitions, it's essential to work within the same range for both spaces, typically between 0 and 255.
Solution:
To address this requirement, let's explore proven algorithms that efficiently convert colors between RGB and HSV within the specified range:
typedef struct {
double r;
double g;
double b;
} rgb;
typedef struct {
double h;
double s;
double v;
} hsv;
hsv rgb2hsv(rgb in)
{
hsv out;
double min, max, delta;
min = in.r < in.g ? in.r : in.g;
min = min < in.b ? min : in.b;
max = in.r > in.g ? in.r : in.g;
max = max > in.b ? max : in.b;
out.v = max;
delta = max - min;
if (delta < 0.00001)
{
out.s = 0;
out.h = 0; // undefined, maybe nan?
return out;
}
if( max > 0.0 ) { // NOTE: if Max is == 0, this divide would cause a crash
out.s = (delta / max);
} else {
// if max is 0, then r = g = b = 0
// s = 0, h is undefined
out.s = 0.0;
out.h = NAN;
return out;
}
if( in.r >= max ) // > is bogus, just keeps compilor happy
out.h = ( in.g - in.b ) / delta; // between yellow & magenta
else
if( in.g >= max )
out.h = 2.0 + ( in.b - in.r ) / delta; // between cyan & yellow
else
out.h = 4.0 + ( in.r - in.g ) / delta; // between magenta & cyan
out.h *= 60.0;
if( out.h < 0.0 )
out.h += 360.0;
return out;
}rgb hsv2rgb(hsv in)
{
double hh, p, q, t, ff;
long i;
rgb out;
if(in.s <= 0.0) {
out.r = in.v;
out.g = in.v;
out.b = in.v;
return out;
}
hh = in.h;
if(hh >= 360.0) hh = 0.0;
hh /= 60.0;
i = (long)hh;
ff = hh - i;
p = in.v * (1.0 - in.s);
q = in.v * (1.0 - (in.s * ff));
t = in.v * (1.0 - (in.s * (1.0 - ff)));
switch(i) {
case 0:
out.r = in.v;
out.g = t;
out.b = p;
break;
case 1:
out.r = q;
out.g = in.v;
out.b = p;
break;
case 2:
out.r = p;
out.g = in.v;
out.b = t;
break;
case 3:
out.r = p;
out.g = q;
out.b = in.v;
break;
case 4:
out.r = t;
out.g = p;
out.b = in.v;
break;
case 5:
default:
out.r = in.v;
out.g = p;
out.b = q;
break;
}
return out;
}The above is the detailed content of How can I efficiently convert RGB to HSV and vice versa within the 0-255 range?. For more information, please follow other related articles on the PHP Chinese website!
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