diff --git a/orx-fx/README.md b/orx-fx/README.md
index 71cf88c8..5a4c87ea 100644
--- a/orx-fx/README.md
+++ b/orx-fx/README.md
@@ -63,12 +63,19 @@ Most blur effects are opacity preserving
  - `ColorCorrection`, corrections for brightness, contrast, saturation and hue
  - `ColorLookup`, Color LUT filter
  - `ColorMix`, filter implementation of OPENRNDR's color matrix mixing
+ - `Duotone`, maps luminosity to two colors, very similar to `LumaMap` but uses LAB color interpolation. 
+ - `DuotoneGradient`, a two-point gradient version of `Duotone`
  - `LumaMap`, maps luminosity to two colors
  - `LumaOpacity`, maps luminosity to opacity but retains source color
  - `LumaThreshold`, applies a treshold on the input luminosity and maps to two colors
+ - `Posterize`, a posterize effect
  - `Sepia`, applies a reddish-brown monochrome tint that imitates an old photograph
  - `SubtractConstant`, subtract a constant color from the source color
 
+### Color conversion
+ - `OkLabToRgb`
+ - `RgbToOkLab`
+ 
 ### Distortion
 
 All distortion effects are opacity preserving
@@ -82,7 +89,8 @@ All distortion effects are opacity preserving
 ### Dither
  - `ADither` - a selection of dithering effects
  - `CMYKHalftone` - a configurable CMYK halftoning effect
- 
+ - `Crosshatch` - crosshatching effect
+ - `LumaHalftone` - a halftoning effect based on luminosity
  ### Edges
   - `LumaSobel` - A Sobel-kernel based luminosity edge detector
   - `EdgesWork` - An edges filter doubling as erosion
diff --git a/orx-fx/build.gradle.kts b/orx-fx/build.gradle.kts
index 84de5d30..26067fd7 100644
--- a/orx-fx/build.gradle.kts
+++ b/orx-fx/build.gradle.kts
@@ -33,6 +33,7 @@ kotlin {
                 defaultSourceSet {
                     kotlin.srcDir("src/demo")
                     dependencies {
+                        implementation(project(":orx-color"))
                         implementation(project(":orx-camera"))
                         implementation("org.openrndr:openrndr-application:$openrndrVersion")
                         implementation("org.openrndr:openrndr-extensions:$openrndrVersion")
@@ -66,6 +67,8 @@ kotlin {
         val commonMain by getting {
             dependencies {
                 implementation(project(":orx-parameters"))
+                implementation(project(":orx-shader-phrases"))
+                implementation(project(":orx-color"))
                 implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:$kotlinxSerializationVersion")
                 implementation("org.openrndr:openrndr-application:$openrndrVersion")
                 implementation("org.openrndr:openrndr-draw:$openrndrVersion")
diff --git a/orx-fx/src/commonMain/kotlin/color/Colorspaces.kt b/orx-fx/src/commonMain/kotlin/color/Colorspaces.kt
index 65318c49..7ed18b24 100644
--- a/orx-fx/src/commonMain/kotlin/color/Colorspaces.kt
+++ b/orx-fx/src/commonMain/kotlin/color/Colorspaces.kt
@@ -1,9 +1,22 @@
 package org.openrndr.extra.fx.color
 
 import org.openrndr.draw.Filter
+import org.openrndr.extra.fx.*
+import org.openrndr.extra.fx.fx_rgb_to_oklab
 import org.openrndr.extra.fx.fx_rgb_to_ycbcr
 import org.openrndr.extra.fx.fx_ycbcr_to_rgb
-import org.openrndr.extra.fx.mppFilterShader
+import org.openrndr.extra.shaderphrases.preprocess
+import org.openrndr.extras.color.phrases.ColorPhraseBook
 
 class RgbToYCbcr : Filter(mppFilterShader(fx_rgb_to_ycbcr, "rgb-to-ycbcr"))
-class YcbcrToRgb : Filter(mppFilterShader(fx_ycbcr_to_rgb, "ycbcr_to_rgb"))
\ No newline at end of file
+class YcbcrToRgb : Filter(mppFilterShader(fx_ycbcr_to_rgb, "ycbcr_to_rgb"))
+
+class RgbToOkLab : Filter(mppFilterShader(run {
+    ColorPhraseBook.register()
+    fx_rgb_to_oklab.preprocess()
+}, "rgb-to-oklab"))
+
+class OkLabToRgb : Filter(mppFilterShader(run {
+    ColorPhraseBook.register()
+    fx_oklab_to_rgb.preprocess()
+}, "oklab-to-rgb"))
diff --git a/orx-fx/src/commonMain/kotlin/color/Duotone.kt b/orx-fx/src/commonMain/kotlin/color/Duotone.kt
new file mode 100644
index 00000000..2464eaa8
--- /dev/null
+++ b/orx-fx/src/commonMain/kotlin/color/Duotone.kt
@@ -0,0 +1,37 @@
+package org.openrndr.extra.fx.color
+
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.Filter
+import org.openrndr.draw.filterShaderFromCode
+import org.openrndr.extra.fx.fx_duotone
+import org.openrndr.extra.parameters.BooleanParameter
+
+import org.openrndr.extra.parameters.ColorParameter
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.shaderphrases.preprocess
+import org.openrndr.extras.color.phrases.ColorPhraseBook
+import org.openrndr.extras.color.presets.CORAL
+import org.openrndr.extras.color.presets.DARK_GRAY
+import org.openrndr.extras.color.presets.NAVY
+
+@Description("Duotone")
+class Duotone : Filter(filterShaderFromCode(run {
+    ColorPhraseBook.register()
+    fx_duotone.preprocess()
+}, "duotone")) {
+
+    @ColorParameter("background", order = 0)
+    var backgroundColor: ColorRGBa by parameters
+
+    @ColorParameter("foreground", order = 1)
+    var foregroundColor: ColorRGBa by parameters
+
+    @BooleanParameter("LAB interpolation", order = 2)
+    var labInterpolation: Boolean by parameters
+
+    init {
+        backgroundColor = ColorRGBa.NAVY
+        foregroundColor = ColorRGBa.CORAL
+        labInterpolation = true
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/commonMain/kotlin/color/DuotoneGradient.kt b/orx-fx/src/commonMain/kotlin/color/DuotoneGradient.kt
new file mode 100644
index 00000000..a67a64b6
--- /dev/null
+++ b/orx-fx/src/commonMain/kotlin/color/DuotoneGradient.kt
@@ -0,0 +1,49 @@
+package org.openrndr.extra.fx.color
+
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.Filter
+import org.openrndr.draw.filterShaderFromCode
+import org.openrndr.extra.fx.fx_duotone_gradient
+import org.openrndr.extra.parameters.BooleanParameter
+
+import org.openrndr.extra.parameters.ColorParameter
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+import org.openrndr.extra.shaderphrases.preprocess
+import org.openrndr.extras.color.phrases.ColorPhraseBook
+import org.openrndr.extras.color.presets.CORAL
+import org.openrndr.extras.color.presets.NAVY
+
+@Description("Duotone Gradient")
+class DuotoneGradient : Filter(filterShaderFromCode(run {
+    ColorPhraseBook.register()
+    fx_duotone_gradient.preprocess()
+}, "duotone-gradient")) {
+
+    @ColorParameter("background 0", order = 0)
+    var backgroundColor0: ColorRGBa by parameters
+
+    @ColorParameter("foreground 0", order = 1)
+    var foregroundColor0: ColorRGBa by parameters
+
+    @ColorParameter("background 1", order = 2)
+    var backgroundColor1: ColorRGBa by parameters
+
+    @ColorParameter("foreground 1", order = 3)
+    var foregroundColor1: ColorRGBa by parameters
+
+    @BooleanParameter("LAB interpolation", order = 4)
+    var labInterpolation: Boolean by parameters
+
+    @DoubleParameter("rotation", -180.0, 180.0, order = 5)
+    var rotation: Double by parameters
+
+    init {
+        backgroundColor0 = ColorRGBa.NAVY
+        foregroundColor0 = ColorRGBa.CORAL
+        backgroundColor1 = ColorRGBa.BLACK
+        foregroundColor1 = ColorRGBa.WHITE
+        rotation = 0.0
+        labInterpolation = true
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/commonMain/kotlin/color/Posterize.kt b/orx-fx/src/commonMain/kotlin/color/Posterize.kt
new file mode 100644
index 00000000..6e0241f2
--- /dev/null
+++ b/orx-fx/src/commonMain/kotlin/color/Posterize.kt
@@ -0,0 +1,32 @@
+package org.openrndr.extra.fx.color
+
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.Filter
+import org.openrndr.draw.filterShaderFromCode
+import org.openrndr.extra.fx.fx_duotone
+import org.openrndr.extra.fx.fx_posterize
+import org.openrndr.extra.parameters.BooleanParameter
+
+import org.openrndr.extra.parameters.ColorParameter
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.IntParameter
+import org.openrndr.extra.shaderphrases.preprocess
+import org.openrndr.extras.color.phrases.ColorPhraseBook
+import org.openrndr.extras.color.presets.CORAL
+import org.openrndr.extras.color.presets.DARK_GRAY
+import org.openrndr.extras.color.presets.NAVY
+
+@Description("Posterize")
+class Posterize : Filter(filterShaderFromCode(fx_posterize, "posterize")) {
+
+    @IntParameter("levels", 2, 32, order = 0)
+    var levels: Int by parameters
+
+    @IntParameter("window", 1, 8, order = 0)
+    var window: Int by parameters
+
+    init {
+        levels = 4
+        window = 1
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/commonMain/kotlin/distort/Lenses.kt b/orx-fx/src/commonMain/kotlin/distort/Lenses.kt
index bfb81c2d..3e8f2d64 100644
--- a/orx-fx/src/commonMain/kotlin/distort/Lenses.kt
+++ b/orx-fx/src/commonMain/kotlin/distort/Lenses.kt
@@ -43,7 +43,8 @@ class Lenses : Filter(mppFilterShader(fx_lenses, "block-repeat")) {
         rows = 6
         columns = 8
         distort = 0.0
-
+        scale = 1.0
+        rotation = 0.0
         bicubicFiltering = true
     }
 }
diff --git a/orx-fx/src/commonMain/kotlin/dither/LumaHalftone.kt b/orx-fx/src/commonMain/kotlin/dither/LumaHalftone.kt
new file mode 100644
index 00000000..34ed1456
--- /dev/null
+++ b/orx-fx/src/commonMain/kotlin/dither/LumaHalftone.kt
@@ -0,0 +1,53 @@
+package org.openrndr.extra.fx.dither
+
+import org.openrndr.draw.Filter
+import org.openrndr.draw.filterShaderFromCode
+import org.openrndr.extra.fx.fx_luma_halftone
+import org.openrndr.extra.parameters.BooleanParameter
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+
+
+@Description("Luma Halftone")
+class LumaHalftone: Filter(filterShaderFromCode(fx_luma_halftone, "luma-halftone")) {
+    @DoubleParameter("scale", 1.0, 30.0, precision = 4)
+    var scale: Double by parameters
+
+    @DoubleParameter("threshold", 0.0, 1.0, precision = 4)
+    var threshold: Double by parameters
+
+    @DoubleParameter("rotation", -180.0, 180.0)
+    var rotation: Double by parameters
+
+    @DoubleParameter("freq0", 1.0, 400.0)
+    var freq0: Double by parameters
+
+    @DoubleParameter("freq1", 1.0, 400.0)
+    var freq1: Double by parameters
+
+    @DoubleParameter("gain1", -2.0, 2.0)
+    var gain1: Double by parameters
+
+    @DoubleParameter("phase0", -1.0, 1.0)
+    var phase0: Double by parameters
+
+    @DoubleParameter("phase1", -1.0, 1.0)
+    var phase1: Double by parameters
+
+
+    @BooleanParameter("invert")
+    var invert: Boolean by parameters
+
+
+    init {
+        scale = 3.0
+        rotation = 0.0
+        threshold = 0.5
+        freq1 = 20.0
+        freq0 = 10.0
+        gain1 = 0.1
+        phase0 = 0.0
+        phase1 = 0.0
+        invert = true
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/demo/kotlin/DemoColorDuotone01.kt b/orx-fx/src/demo/kotlin/DemoColorDuotone01.kt
new file mode 100644
index 00000000..b5a6a7b4
--- /dev/null
+++ b/orx-fx/src/demo/kotlin/DemoColorDuotone01.kt
@@ -0,0 +1,26 @@
+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)
+
+            }
+
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/demo/kotlin/DemoColorDuotoneGradient01.kt b/orx-fx/src/demo/kotlin/DemoColorDuotoneGradient01.kt
new file mode 100644
index 00000000..1cbffdac
--- /dev/null
+++ b/orx-fx/src/demo/kotlin/DemoColorDuotoneGradient01.kt
@@ -0,0 +1,25 @@
+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)
+        }
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/demo/kotlin/DemoColorPosterize01.kt b/orx-fx/src/demo/kotlin/DemoColorPosterize01.kt
new file mode 100644
index 00000000..ce265c02
--- /dev/null
+++ b/orx-fx/src/demo/kotlin/DemoColorPosterize01.kt
@@ -0,0 +1,25 @@
+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)
+
+            }
+
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/demo/kotlin/DemoDitherLumaHalftone01.kt b/orx-fx/src/demo/kotlin/DemoDitherLumaHalftone01.kt
new file mode 100644
index 00000000..25f4cfce
--- /dev/null
+++ b/orx-fx/src/demo/kotlin/DemoDitherLumaHalftone01.kt
@@ -0,0 +1,26 @@
+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)
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/demo/kotlin/DemoOkLab01.kt b/orx-fx/src/demo/kotlin/DemoOkLab01.kt
new file mode 100644
index 00000000..917b258d
--- /dev/null
+++ b/orx-fx/src/demo/kotlin/DemoOkLab01.kt
@@ -0,0 +1,27 @@
+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)
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/shaders/glsl/color/duotone-gradient.frag b/orx-fx/src/shaders/glsl/color/duotone-gradient.frag
new file mode 100644
index 00000000..23c6a356
--- /dev/null
+++ b/orx-fx/src/shaders/glsl/color/duotone-gradient.frag
@@ -0,0 +1,64 @@
+#pragma import color.oklab_to_linear_rgb
+#pragma import color.linear_rgb_to_oklab
+#pragma import color.linear_rgb_to_srgb
+#pragma import color.srgb_to_linear_rgb
+
+uniform vec4 tint;
+in vec2 v_texCoord0;
+uniform sampler2D tex0;
+uniform vec4 backgroundColor0;
+uniform vec4 foregroundColor0;
+
+uniform vec4 backgroundColor1;
+uniform vec4 foregroundColor1;
+
+uniform bool labInterpolation;
+uniform float rotation;
+out vec4 o_color;
+void main() {
+    vec4 c = texture(tex0, v_texCoord0);
+    if (c.a != 0.0) {
+        c.rgb /= c.a;
+    }
+    float ca = cos(radians(rotation));
+    float sa = sin(radians(rotation));
+    mat2 rm = mat2(vec2(ca, sa), vec2(-sa, ca));
+
+    float f = (rm * (v_texCoord0 - vec2(0.5)) + vec2(0.5)).x;
+
+    vec4 bg0 = backgroundColor0;
+    bg0.rgb *= backgroundColor0.a;
+    vec4 fg0 = foregroundColor0;
+    fg0.rgb *= foregroundColor0.a;
+
+    vec4 bg1 = backgroundColor1;
+    bg1.rgb *= backgroundColor1.a;
+    vec4 fg1 = foregroundColor1;
+    fg1.rgb *= foregroundColor1.a;
+
+
+    if (!labInterpolation) {
+        vec4 bg = mix(bg0, bg1, f);
+        vec4 fg = mix(fg0, fg1, f);
+
+        o_color = mix(bg, fg, c.r) * c.a;
+    } else {
+        bg0 = srgb_to_linear_rgb(bg0);
+        bg0 = linear_rgb_to_oklab(bg0);
+        fg0 = srgb_to_linear_rgb(fg0);
+        fg0 = linear_rgb_to_oklab(fg0);
+        bg1 = srgb_to_linear_rgb(bg1);
+        bg1 = linear_rgb_to_oklab(bg1);
+        fg1 = srgb_to_linear_rgb(fg1);
+        fg1 = linear_rgb_to_oklab(fg1);
+
+        vec4 bg = mix(bg0, bg1, f);
+        vec4 fg = mix(fg0, fg1, f);
+
+        vec4 m = mix(bg, fg, c.r);
+        m = oklab_to_linear_rgb(m);
+        m *= c.a;
+        m = linear_rgb_to_srgb(m);
+        o_color = m;
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/shaders/glsl/color/duotone.frag b/orx-fx/src/shaders/glsl/color/duotone.frag
new file mode 100644
index 00000000..8750cefc
--- /dev/null
+++ b/orx-fx/src/shaders/glsl/color/duotone.frag
@@ -0,0 +1,38 @@
+#pragma import color.oklab_to_linear_rgb
+#pragma import color.linear_rgb_to_oklab
+#pragma import color.linear_rgb_to_srgb
+#pragma import color.srgb_to_linear_rgb
+
+uniform vec4 tint;
+in vec2 v_texCoord0;
+uniform sampler2D tex0;
+uniform vec4 backgroundColor;
+uniform vec4 foregroundColor;
+uniform bool labInterpolation;
+out vec4 o_color;
+void main() {
+    vec4 c = texture(tex0, v_texCoord0);
+    if (c.a != 0.0) {
+        c.rgb /= c.a;
+    }
+
+    vec4 bg = backgroundColor;
+    bg.rgb *= backgroundColor.a;
+    vec4 fg = foregroundColor;
+    fg.rgb *= foregroundColor.a;
+
+    if (!labInterpolation) {
+        o_color = mix(bg, fg, c.r) * c.a;
+    } else {
+        bg = srgb_to_linear_rgb(bg);
+        bg = linear_rgb_to_oklab(bg);
+        fg = srgb_to_linear_rgb(fg);
+        fg = linear_rgb_to_oklab(fg);
+
+        vec4 m = mix(bg, fg, c.r);
+        m = oklab_to_linear_rgb(m);
+        m *= c.a;
+        m = linear_rgb_to_srgb(m);
+        o_color = m;
+    }
+}
\ No newline at end of file
diff --git a/orx-fx/src/shaders/glsl/color/oklab-to-rgb.frag b/orx-fx/src/shaders/glsl/color/oklab-to-rgb.frag
new file mode 100644
index 00000000..501e03f6
--- /dev/null
+++ b/orx-fx/src/shaders/glsl/color/oklab-to-rgb.frag
@@ -0,0 +1,12 @@
+#pragma import color.oklab_to_linear_rgb
+#pragma import color.linear_rgb_to_srgb
+out vec4 o_output;
+
+in vec2 v_texCoord0;
+uniform sampler2D tex0;
+
+void main() {
+    vec4 lab = texture(tex0, v_texCoord0);
+    vec4 rgba = oklab_to_linear_rgb(lab);
+    o_output = linear_rgb_to_srgb(rgba);
+}
\ No newline at end of file
diff --git a/orx-fx/src/shaders/glsl/color/posterize.frag b/orx-fx/src/shaders/glsl/color/posterize.frag
new file mode 100644
index 00000000..0f0e771e
--- /dev/null
+++ b/orx-fx/src/shaders/glsl/color/posterize.frag
@@ -0,0 +1,26 @@
+in vec2 v_texCoord0;
+uniform int window;
+uniform sampler2D tex0;
+uniform int levels;
+out vec4 o_output;
+void main() {
+    vec4 c = texture(tex0, v_texCoord0);
+    vec2 step = 1.0 / textureSize(tex0, 0);
+    float w = 0.0;
+    vec3 s = vec3(0.0);
+    for (int v = -window; v <= window; ++v) {
+        for (int u = -window; u <= window; ++u) {
+            vec4 c = texture(tex0, v_texCoord0 + (step/(2*window)) * vec2(u,v) );
+            if (c.a != 0.0) {
+                c.rgb /= c.a;
+            }
+            vec3 q = min(floor(c.rgb * (levels))/(levels-1), vec3(1.0));
+            s += q;
+            w += 1.0;
+        }
+    }
+    vec3 q = s / w;
+
+
+    o_output = vec4(q*c.a, c.a);
+}
\ No newline at end of file
diff --git a/orx-fx/src/shaders/glsl/color/rgb-to-oklab.frag b/orx-fx/src/shaders/glsl/color/rgb-to-oklab.frag
new file mode 100644
index 00000000..41192b3f
--- /dev/null
+++ b/orx-fx/src/shaders/glsl/color/rgb-to-oklab.frag
@@ -0,0 +1,12 @@
+#pragma import color.linear_rgb_to_oklab
+#pragma import color.srgb_to_linear_rgb
+out vec4 o_output;
+
+in vec2 v_texCoord0;
+uniform sampler2D tex0;
+
+void main() {
+    vec4 srgba = texture(tex0, v_texCoord0);
+    vec4 rgba = srgb_to_linear_rgb(srgba);
+    o_output = linear_rgb_to_oklab(rgba);
+}
\ No newline at end of file
diff --git a/orx-fx/src/shaders/glsl/distort/perturb.frag b/orx-fx/src/shaders/glsl/distort/perturb.frag
index b0213d2b..d1c83125 100644
--- a/orx-fx/src/shaders/glsl/distort/perturb.frag
+++ b/orx-fx/src/shaders/glsl/distort/perturb.frag
@@ -128,10 +128,8 @@ float snoise(vec3 v)
 }
 
 vec3 segment(vec3 t, int x, int y) {
-
     float sx = x == 0? t.x : floor(t.x * x) / x;
     float sy = y == 0? t.y : floor(t.y * y) / y;
-
     return vec3(sx,sy, t.z);
 }
 
diff --git a/orx-fx/src/shaders/glsl/dither/luma-halftone.frag b/orx-fx/src/shaders/glsl/dither/luma-halftone.frag
new file mode 100644
index 00000000..23da91f7
--- /dev/null
+++ b/orx-fx/src/shaders/glsl/dither/luma-halftone.frag
@@ -0,0 +1,62 @@
+uniform float scale;
+uniform float rotation;
+in vec2 v_texCoord0;
+uniform sampler2D tex0;
+out vec4 o_color;
+uniform float threshold;
+
+uniform float freq0;
+uniform float freq1;
+uniform float gain1;
+uniform float phase0;
+uniform float phase1;
+uniform bool invert;
+
+float cosine_sample(vec2 uv){
+    float ca = cos(radians(rotation));
+    float sa = sin(radians(rotation));
+
+    vec2 ts = textureSize(tex0, 0);
+    mat2 rm = mat2(1.0, 0.0, 0.0, ts.x/ts.y) * mat2(vec2(ca, sa), vec2(-sa, ca)) * mat2(1.0, 0.0, 0.0, ts.y/ts.x);
+
+    vec2 cuv = (rm * (uv - vec2(0.5))) + vec2(0.5);
+
+    float m = fract(phase0 + cuv.x*freq0 + cos(cuv.y*freq1+phase1*3.141592653)*gain1);
+    vec4 c = texture(tex0, v_texCoord0);
+    if (c.a != 0.0) {
+        c.rgb /= c.a;
+    }
+    float l = dot(vec3(1.0/3.0), c.rgb);
+    if (invert) {
+        l = 1 - l;
+    }
+
+    float t = 0.0;
+    t = step(threshold, l * m);
+    return t;
+}
+
+float cosine_halftone(vec2 uv) {
+    int w = 3;
+    vec2 step = 1.0 / textureSize(tex0, 0);
+    step /= (2*w);
+    float weight = 0.0;
+    float sum = 0.0;
+    for (int v = -w; v <= w; ++v) {
+        for (int u = -w; u <= w; ++u) {
+            sum += cosine_sample(uv + step * vec2(u, v));
+            weight+=1;
+        }
+    }
+    return sum / weight;
+}
+
+
+void main() {
+    vec4 c = texture(tex0, v_texCoord0);
+    float t = cosine_halftone(v_texCoord0);
+    if (invert) {
+        t = 1 - t;
+    }
+    o_color = vec4(t, t, t, 1.0) * c.a;
+}
\ No newline at end of file