FontHinting

Lighter hinting algorithm– glyphs are slightly fuzzier but better resemble their original shape.

This is achieved by snapping glyphs to the pixel grid only vertically which better preserves inter-glyph spacing.

Default hinting algorithm– offers a good balance between sharpness and shape at smaller font sizes.

Strongest hinting algorithm– outputs only black/white glyphs.

The result is usually unpleasant if the underlying TTF does not contain hints for this type of rendering.