Add layer blend mode information

Author: huntfx

README.md

@@ -63,6 +63,10 @@ MouseTracks is and will always remain free, but if you enjoy using it and would
 - ### Stability
   A lot of effort has been put into making this as error free as possible, so it will happily keep running for years without any issues.
 
+- ### Advanced Rendering
+  All internal rendering settings can be edited and previewed live in the GUI.
+  Go one step further and use the layer blending modes to combine multiple renders together.
+
 ---
 
 ## Installation (v2.0)
@@ -269,6 +273,30 @@ It's also possible to [define your own](https://github.com/huntfx/MouseTracks/wi
 ### Chalk
 <img src="media/render-colours/keyboard/chalk.jpg">
 
+## Layer Blending
+This option is hidden under the "Advanced" settings, and was more of a fun side project rather than serious feature. Multiple layers can be rendered live together, with a few presets to get started.
+
+#### Plasma
+Uses the "Hard Light" blend mode to create high contrast and deep colours.
+<img src="media/layer-presets/plasma.jpg">
+
+#### Heatmap Overlay
+Basic example of drawing the click heatmap over the tracks, using "Luminance Mask" to make the black parts transparent.
+<img src="media/layer-presets/heatmap-overlay.jpg">
+
+#### RGB Clicks
+Three identical black and white click renders, each with only with a single colour channel enabled.
+The left mouse button is red, middle is green and right is blue.
+<img src="media/layer-presets/rgb-clicks.jpg">
+
+#### Urban Moss
+Combines both movement and speed data for an effect that's like moss growing on concrete.
+<img src="media/layer-presets/urban-moss.jpg">
+
+#### Eraser
+Subtracts the clicks from the movement, resulting in what looks like a pencil drawing that's been rubbed out.
+<img src="media/layer-presets/eraser.jpg">
+
 ## Example Renders
 #### Desktop
 <img src="media/render-types/mouse-movement.jpg">

media/layer-presets/eraser.jpg

@@ -475,7 +475,7 @@ def __init__(self, component: GUI) -> None:
         self.ui.layer_presets.addItem('Heatmap Overlay')
         self.ui.layer_presets.addItem('Heatmap Tracks')
         self.ui.layer_presets.addItem('Alpha Multiply')
-        self.ui.layer_presets.addItem('Urban Grass')
+        self.ui.layer_presets.addItem('Urban Moss')
         self.ui.layer_presets.addItem('Eraser')
         self.ui.layer_presets.addItem('Plasma')
         self.ui.layer_presets.addItem('RGB Clicks')
@@ -3083,7 +3083,7 @@ def layer_preset_chosen(self, idx: int) -> None:
                 self.selected_layer.clipping.heatmap = 0.85
                 self.selected_layer.contrast.heatmap = 0.5
 
-            case 'Urban Grass':
+            case 'Urban Moss':
                 self.ui.layer_list.clear()
                 layer_0 = self.add_render_layer()
                 layer_0.setCheckState(QtCore.Qt.CheckState.Checked)