DitherFx

▒░ Dither post effect for Unity Urp, controlled via volume profile ▒░ Works as render feature or a pass for selective post processing VolFx

Features

• custom palettes and patterns
• pattern distribution ​and animation options
• noise mode

Part of Artwork Project

• Vhs
• OldMovie
• GradientMap
• ScreenOutline
• ImageFlow
• Pixelation
• Ascii
• [Dither]
• ...

Usage

Install via Unity PackageManager

https://github.com/NullTale/DitherFx.git

Works as render feature, some parameters and default volume settings can be configured in the asset.

Tech

The effect works by calculating a deviation for each pixel of the original image from the nearest color, if it is large enough it replaces it with the second closest color from the palette doing it according to the ScreenSpace pattern or random noise.

Dither Power, palette, pattern type and its animation can be customized in VolumeSettings or in RenderFeature settings. All calculations are performed in the fragment shader through hased Lut tables.

To measure a colors of an original image three lut table are used

• palette color - color replacement from the palette
• deviation color - second closest color from the palette
• and measure - distance to the clossets color, used evaluate dithering power

Tables are generated at Runtime when an unknown palette is used for the first time and shared beetween all features.