HSV

色空間 > HLS

• HSB とも呼ぶ

• HSLのかいせつ。
  • http://moon.gmobb.jp/renno/cgi/junk.cgi/paintgraphic2/rikutsu/hsl.htm
• ImageMagickでHSLとHSV色空間を理解する
  • http://smash.nobuto-murata.org/2009/12/imagemagickhslhsv.html

変換式

• rgb2hsv
  • http://9ffb2529c70454bd41d0-3fb10b1a8c4ec78f5e672fbc3d967936.r30.cf2.rackcdn.com/rgb2hsv.html

V = max(R,G,B)
S = (V-min(R,G,B))/V if V<>0, 0 otherwise
H =
 (G - B)/6/S, if V=R;
 1/2+(B - R)/6/S, if V=G;
 2/3+(R - G)/6/S, if V=B.

• Converting between RGB and HSV color space

• https://qiita.com/keim_at_si/items/c2d1afd6443f3040e900

  // clamp( abs(fract(h+vec3(0,2,1)/3) * 6 - 3) - 1, 0, 1)
  return ((clamp(abs(fract(h+vec3(0,2,1)/3.)*6.-3.)-1.,0.,1.)-1.)*s+1.)*v;

• http://jp.wgld.org/js4kintro/editor/#precision...

  vec3 hsv(float h, float s, float v){
  	vec4 t = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
  	vec3 p = abs(fract(vec3(h) + t.xyz) * 6.0 - vec3(t.w));
  	return v * mix(vec3(t.x), clamp(p - vec3(t.x), 0.0, 1.0), s);
  }

• Color Channels
  • http://bersoft.com/bimagem/help/color_channels.htm (20210107)

関連

• 色