h,
m,
r,
- x;
+ x,
+ z;
/*
Convert HCL to RGB colorspace.
b=0.0;
if ((0.0 <= h) && (h < 1.0))
{
- r=c;
- g=x;
+ r=c;
+ g=x;
}
else
if ((1.0 <= h) && (h < 2.0))
{
- r=x;
- g=c;
+ r=x;
+ g=c;
}
else
if ((2.0 <= h) && (h < 3.0))
{
- g=c;
- b=x;
+ g=c;
+ b=x;
}
else
if ((3.0 <= h) && (h < 4.0))
{
- g=x;
- b=c;
+ g=x;
+ b=c;
}
else
if ((4.0 <= h) && (h < 5.0))
{
- r=x;
- b=c;
+ r=x;
+ b=c;
}
else
if ((5.0 <= h) && (h < 6.0))
{
- r=c;
- b=x;
+ r=c;
+ b=x;
}
- m=luma-0.298839*r+0.586811*g+0.114350*b;
- *red=QuantumRange*(r+m);
- *green=QuantumRange*(g+m);
- *blue=QuantumRange*(b+m);
+ m=luma-(0.298839*r+0.586811*g+0.114350*b);
+ /*
+ Choose saturation strategy to clip it into the RGB cube; hue and luma are
+ preserved and chroma may be changed.
+ */
+ z=1.0;
+ if (m < 0.0)
+ {
+ z=luma/(luma-m);
+ m=0.0;
+ }
+ else
+ if ((m+c) > 1.0)
+ {
+ z=(1.0-luma)/(m+c-luma);
+ m=1.0-z*c;
+ }
+ *red=QuantumRange*(z*r+m);
+ *green=QuantumRange*(z*g+m);
+ *blue=QuantumRange*(z*b+m);
}
\f
/*
max=MagickMax(r,MagickMax(g,b));
c=max-(double) MagickMin(r,MagickMin(g,b));
h=0.0;
- if (c == 0)
+ if (c == 0.0)
h=0.0;
else
if (red == max)
- h=fmod((g-b)/c,6.0);
+ h=fmod((g-b)/c+6.0,6.0);
else
if (green == max)
h=((b-r)/c)+2.0;