Color Selection filter

effects/colorsel.frag

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+/* Filter by color characteristic simple program
+Based on Edward Cannon's Simple Chroma Key (adaptation by Olive Team)
+RGB to HSV based on MattKC's toonify source code
+Feel free to modify and use at will */
+#version 150
+
+uniform sampler2D tex;
+varying vec2 vTexCoord;
+
+uniform float loc;
+uniform float hic;
+uniform int compo;
+
+float rgb2luma(vec3 c) {
+    return (max(max(c.r,c.g), c.b) + min(min(c.r,c.g), c.b))/2.0;
+}
+
+vec3 rgb2hsv(vec3 c) 
+{
+     float r = c.r;
+     float b = c.b;
+     float g = c.g;
+	 float minv, maxv, delta;
+	 vec3 res;
+
+	 minv = min(min(r, g), b);
+	 maxv = max(max(r, g), b);
+	 res.z = maxv;            // v
+	 
+	 delta = maxv - minv;
+
+	 if( maxv != 0.0 )
+			res.y = delta / maxv;      // s
+	 else {
+			// r = g = b = 0      // s = 0, v is undefined
+			res.y = 0.0;
+			res.x = -1.0;
+			return res;
+	 }
+
+	 if( r == maxv )
+			res.x = ( g - b ) / delta;      // between yellow & magenta
+	 else if( g == maxv )
+			res.x = 2.0 + ( b - r ) / delta;   // between cyan & yellow
+	 else
+			res.x = 4.0 + ( r - g ) / delta;   // between magenta & cyan
+
+	 res.x = res.x * 60.0;            // degrees
+	 if( res.x < 0.0 )
+			res.x = res.x + 360.0;
+			
+	 return res;
+}
+
+bool isNotIncreasingSequence(float a, float b, float c) {
+    return (c < b || a > b);
+}
+
+void main(void) {
+	vec4 tc = texture2D(tex,vTexCoord);
+    vec3 color = tc.rgb;
+    float toCheck = 0.0;
+    
+	switch(compo) {
+        case 0 :
+            toCheck = rgb2luma(color);
+            break;
+        case 4 :
+            toCheck = color.r;
+            break;
+        case 5 :
+            toCheck = color.g;
+            break;
+        case 6 :
+            toCheck = color.b;
+            break;
+        case 1 :
+            toCheck = rgb2hsv(color).z;
+            break;
+        case 2 :
+            toCheck = rgb2hsv(color).x/360.0;
+            break;
+        case 3 :
+            toCheck = rgb2hsv(color).y;
+            break;
+	}
+	tc.a = isNotIncreasingSequence(loc, toCheck, hic) ? 0.0 : tc.a;
+	gl_FragColor = tc;
+}

effects/colorsel.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<effect name="Color Finder" category="Keying">
+    <row name="Find by">
+        <field type="combo" default="0" id="compo">
+			<option>Luminance</option>
+            <option>Value</option>
+            <option>Hue</option>
+            <option>Saturation</option>
+            <option>Red</option>
+			<option>Green</option>
+			<option>Blue</option>
+		</field>
+    </row>
+	<row name="Lower Limit">
+		<field type="double" min="0" default="0" max="1" id="loc"/>
+	</row>
+	<row name="Upper Limit">
+		<field type="double" min="0" default="1" max="1" id="hic"/>
+	</row>
+	<shader vert="common.vert" frag="colorsel.frag"/>
+</effect>