Sepia and Grain Noise

camera-effects/grain-noise.gdshader

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+shader_type canvas_item;
+
+uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear;
+void fragment() {
+    // Readbackground and foreground images.
+	vec4 col = texture(SCREEN_TEXTURE, UV);
+
+    // Sepia tone, from
+    // https://www.techrepublic.com/blog/how-do-i/how-do-i-convert-images-to-grayscale-and-sepia-tone-using-c
+	vec3 sepia = vec3(
+        col.r * .393 + col.g *.769 + col.b * .189,
+        col.r * .349 + col.g *.686 + col.b * .168,
+		col.r * .272 + col.g *.534 + col.b * .131);
+		
+    // Film grain, from
+    // https://www.reddit.com/r/opengl/comments/1rr4fy/any_good_ways_of_generating_film_grain_noise
+    const float noiseStrength = 50.0;
+    float x = (UV.x + 4.0) * (UV.y + 4.0) * (TIME * 10.0);
+    vec3 grain = vec3(mod((mod(x, 13.0) + 1.0) * (mod(x, 123.0) + 1.0), 0.01) - 0.005) * noiseStrength;
+
+    COLOR = vec4(sepia + grain, 1.0);
+}

camera-effects/grain_noise.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://cf1adbox8xy7e"]
+
+[ext_resource type="Shader" path="res://camera-effects/grain-noise.gdshader" id="1_r8x04"]
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_pwuts"]
+shader = ExtResource("1_r8x04")
+
+[node name="Grain Noise" type="ColorRect"]
+material = SubResource("ShaderMaterial_pwuts")
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2

camera-effects/sepia.gdshader

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+shader_type canvas_item;
+
+// inspired by: https://www.shadertoy.com/view/Xl3cDn
+
+uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear;
+
+void fragment() {
+    vec4 col = texture(SCREEN_TEXTURE, UV);
+
+	vec3 sepia = vec3(
+        col.r * .393 + col.g *.769 + col.b * .189,
+        col.r * .349 + col.g *.686 + col.b * .168,
+		col.r * .272 + col.g *.534 + col.b * .131);
+		
+	COLOR = vec4(sepia, 1.0);
+}

camera-effects/sepia.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://dv3o1u4hc11vn"]
+
+[ext_resource type="Shader" path="res://camera-effects/sepia.gdshader" id="1_5124a"]
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_qria4"]
+shader = ExtResource("1_5124a")
+
+[node name="Sepia" type="ColorRect"]
+material = SubResource("ShaderMaterial_qria4")
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2