[orx-fx] Add Duotone, DuotoneGradient, LumaHalftone, Posterize, RgbToOkLab, OkLabToRgb

orx-fx/src/demo/kotlin/DemoColorDuotone01.kt

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+import org.openrndr.extra.fx.color.Duotone
+import org.openrndr.application
+import org.openrndr.draw.createEquivalent
+import org.openrndr.draw.loadImage
+import org.openrndr.math.mod_
+
+fun main() {
+    application {
+        program {
+
+            val image = loadImage("demo-data/images/image-001.png")
+            val filteredImage = image.createEquivalent()
+            val duotone = Duotone()
+
+            extend {
+
+                duotone.labInterpolation = seconds.mod_(2.0) < 1.0
+                duotone.apply(image, filteredImage)
+                drawer.image(filteredImage)
+
+            }
+
+        }
+
+    }
+}

orx-fx/src/demo/kotlin/DemoColorDuotoneGradient01.kt

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+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.createEquivalent
+import org.openrndr.draw.loadImage
+import org.openrndr.extra.fx.color.DuotoneGradient
+
+fun main() = application {
+    program {
+        val image = loadImage("demo-data/images/image-001.png")
+        val filteredImage = image.createEquivalent()
+        val duotone = DuotoneGradient()
+        duotone.labInterpolation = false
+
+        extend {
+            duotone.labInterpolation = true
+            duotone.backgroundColor0 = ColorRGBa.BLACK
+            duotone.foregroundColor0 = ColorRGBa.RED
+            duotone.backgroundColor1 = ColorRGBa.BLUE
+            duotone.foregroundColor1 = ColorRGBa.WHITE
+            duotone.rotation = seconds * 45.0
+            duotone.apply(image, filteredImage)
+            drawer.image(filteredImage)
+        }
+    }
+}

orx-fx/src/demo/kotlin/DemoColorPosterize01.kt

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+import org.openrndr.extra.fx.color.Duotone
+import org.openrndr.application
+import org.openrndr.draw.createEquivalent
+import org.openrndr.draw.loadImage
+import org.openrndr.extra.fx.color.Posterize
+import org.openrndr.math.mod_
+
+fun main() {
+    application {
+        program {
+            val image = loadImage("demo-data/images/image-001.png")
+            val filteredImage = image.createEquivalent()
+            val posterize = Posterize()
+
+            extend {
+                posterize.levels = 2
+                posterize.apply(image, filteredImage)
+                drawer.image(filteredImage)
+
+            }
+
+        }
+
+    }
+}

orx-fx/src/demo/kotlin/DemoDitherLumaHalftone01.kt

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+import org.openrndr.application
+import org.openrndr.draw.createEquivalent
+import org.openrndr.draw.loadImage
+import org.openrndr.extra.fx.dither.LumaHalftone
+import org.openrndr.math.mod_
+
+fun main() {
+    application {
+        program {
+            val image = loadImage("demo-data/images/image-001.png")
+            val filteredImage = image.createEquivalent()
+            val lumaHalftone = LumaHalftone()
+            extend {
+                lumaHalftone.rotation = -15.0
+                lumaHalftone.freq0 = 100.0
+                lumaHalftone.gain1 = 1.0
+                lumaHalftone.threshold = 0.5
+                lumaHalftone.phase0 = seconds*0.1
+                lumaHalftone.phase1 = -seconds*0.1
+                lumaHalftone.apply(image, filteredImage)
+                lumaHalftone.invert = seconds.mod_(2.0) < 1.0
+                drawer.image(filteredImage)
+            }
+        }
+    }
+}

orx-fx/src/demo/kotlin/DemoOkLab01.kt

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+import org.openrndr.extra.fx.color.RgbToOkLab
+import org.openrndr.extra.fx.color.OkLabToRgb
+import org.openrndr.application
+import org.openrndr.draw.ColorType
+import org.openrndr.draw.createEquivalent
+import org.openrndr.draw.loadImage
+
+/**
+ * This demonstrates converting a [ColorBuffer] from and to (OK)LAB color space using the [RgbToOkLab] and [OkLabToRgb]
+ * filters. The (OK)Lab representation is signed and requires a floating point representation.
+ */
+
+fun main() {
+    application {
+        program {
+            val rgbToOkLab = RgbToOkLab()
+            val okLabToRgb = OkLabToRgb()
+            val image = loadImage("demo-data/images/image-001.png")
+            val labImage = image.createEquivalent(type = ColorType.FLOAT32)
+            rgbToOkLab.apply(image, labImage)
+            okLabToRgb.apply(labImage, image)
+            extend {
+                drawer.image(image)
+            }
+        }
+    }
+}