Add docs about ClearType text rendering (#50)

README.md

@@ -87,6 +87,8 @@ Documentation
 
 - [How to prepare `DefaultTexFont.xml` from the font file][docs-prepare-font]
 
+- [How to improve blurred formulas][docs-blurred-text-issue]
+
 - [Licensing history][docs-licensing-history]
 
 Build Instructions
@@ -127,6 +129,7 @@ We're very grateful to JMathTeX authors for their work and allowing to redistrib
 - Kurt Vermeulen
 
 [docs-prepare-font]: docs/prepare-font.md
+[docs-blurred-text-issue]: docs/blurred-text-issue.md
 [docs-licensing-history]: docs/licensing-history.md
 [example]: WpfMath.Example/
 [fonts]: src/WpfMath/Fonts/

docs/blurred-text-issue.md

@@ -0,0 +1,44 @@
+How to improve blurred formulas
+======================================================
+
+Since `FormulaControl` is a WPF control it has `TextOptions` properties 
+to tune how formulas are rendered. Default settings provides smooth and 
+clear output for large font sizes, but for smaller ones it may looks 
+blurred. It's a personal preference, and if you are unhappy with default 
+settings you may override it by creating custom style:
+
+```xml
+<Window ... xmlns:controls="clr-namespace:WpfMath.Controls;assembly=WpfMath">
+    <Window.Resources>
+        <Style x:Key="ClearTypeFormula" TargetType="controls:FormulaControl">
+            <Setter Property="TextOptions.TextRenderingMode" Value="ClearType" />
+            <Setter Property="TextOptions.TextHintingMode" Value="Fixed" />
+            <Setter Property="TextOptions.TextFormattingMode" Value="Display" />
+        </Style>
+    </Window.Resources>
+
+    <controls:FormulaControl Formula="\left(x^2 + 2 \cdot x + 2\right) = 0"
+                             Style="{StaticResource ClearTypeFormula}" />
+</Window>
+```
+
+Let's see on output for different settings.
+
+- Default settings:
+
+![Formula's rendering with default settings](default.png)
+
+- ClearType style:
+
+![Formula's rendering with ClearType settings](cleartype.png)
+
+Second formula looks great with sharp symbols! But for larger font size it 
+might be not pleasible, so you may want to experiment with WPF rendering 
+options further.
+
+If you still have problems with blurred/noisy formulas, please tell us in 
+this [umbrella issue](https://github.com/ForNeVeR/wpf-math/issues/50). We 
+are trying hard to achieve best-looking rendering on WPF, but sometimes it 
+might be tricky.
+
+Thanks!