hsv2rgb

Scilab Function

Last update : 23/10/2007

hsv2rgb - Converts HSV colors to RGB

Calling Sequence

[r,g,b] = hsv2rgb(h,s,v)

rgb = hsv2rgb(h,s,v)

[r,g,b] = hsv2rgb(hsv)

rgb = hsv2rgb(hsv)

Parameters

h : a vector of size n. The "hue" values.
s : a vector of size n. The "saturation" values.
v : a vector of size n. The "value" values
hsv : a n x 3 matrix. Each row contains a [hue saturation value] tripple.
r : a column vector of size n. The associated "red" values.
g : a column vector of size n. The associated "green" values.
b : a column vector of size n. The associated "blue" values.
rgb : a n x 3 matrix. Each row contains a [red green blue] tripple.

Description

The function hsv2rgb converts colormaps between the RGB and HSV color spaces. As hue varies from 0 to 1.0, the corresponding colors vary from red through yellow, green, cyan, blue, magenta, and back to red, so that there are actually red values both at 0 and 1.0. As saturation varies from 0 to 1.0, the corresponding colors (hues) vary from unsaturated (shades of gray) to fully saturated (no white component). As value, or brightness, varies from 0 to 1.0, the corresponding colors become increasingly brighter.

Examples

    t=[0:0.3:2*%pi]'; z=sin(t)*cos(t'); 
    plot3d1(t,t,z) 
    f=gcf();f.pixmap='on';
    for h=0:0.1:1
      hsv=[h*ones(32,1) linspace(0,1,32)' 0.7*ones(32,1)];
      f.color_map=hsv2rgb(hsv);
      show_pixmap()
      xpause(10000)
    end
    for v=0:0.1:1
      hsv=[ones(32,1) linspace(0,1,32)' v*ones(32,1)];
      f.color_map=hsv2rgb(hsv);
      show_pixmap()
      xpause(10000)
    end

Authors

Serge Steer INRIA