AMD FidelityFX Contrast Adaptive Sharpening (CAS) provides a mixed ability to sharpen and optionally scale an image.

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Xbox Developers
An example use of AMD FidelityFX CAS exists within the Xbox Game Development Kit samples.

Features

Razor sharp visuals

Highly optimized

Open source, MIT license

AMD FidelityFX Contrast Adaptive Sharpening (CAS) provides a mixed ability to sharpen and optionally scale an image. The algorithm adjusts the amount of sharpening per pixel to target an even level of sharpness across the image. Areas of the input image that are already sharp are sharpened less, while areas that lack detail are sharpened more. This allows for higher overall natural visual sharpness with fewer artifacts.

CAS was designed to help increase the quality of existing Temporal Anti-Aliasing (TAA) solutions. TAA often introduces a variable amount of blur due to temporal feedback. The adaptive sharpening provided by CAS is ideal to restore detail in images produced after TAA .

CAS’ optional scaling capability is designed to support Dynamic Resolution Scaling (DRS). DRS changes render resolution every frame, which requires scaling prior to compositing the fixed-resolution User Interface (UI). CAS supports both up-sampling and down-sampling in the same single pass that applies sharpening.

Comparisons

A great example of this is moon surfaces. They have craters, surface rings, mountain ranges, and flat areas that have large contrast differences by design. CAS really shines in this situation, where it successfully allows for the subtle details created by the artists to become clearer in the final render, even with the existing post-processes turned on.

EVE Development Team CCP

See AMD FidelityFX CAS in action with Godfall

You'll also find AMD FidelityFX CAS in The Riftbreaker

Learn more about AMD FidelityFX CAS

Learn how Codemasters integrated AMD FidelityFX CAS into the Ego Engine

FEATURED

Find out exactly how AMD FidelityFX CAS works with our in-depth presentation

POWERPOINT

Developers using AMD FidelityFX

CasCmdLine

Want to quickly try out AMD FidelityFX CAS? You can use our new command-line tool that lets you test it on a screenshot, or any other image.

Download it below, or read the tutorial shown here.

CasCmdLine – Testing AMD FidelityFX Contrast Adaptive Sharpening with the Command Line

CasCmdLine is a simple, command-line Windows program included in the FidelityFX CAS (Contrast Adaptive Sharpening) repository in binary and source form. It lets you test the effect on image files such as screenshots from your game.

Additional resources

Unreal Engine developer?

We don’t want you to miss out on the fun. FidelityFX CAS is for everyone.

A set of guidelines for developers on how to present options in the game’s user interface to enable/disable AMD FidelityFX Effects.

Find out what developers are saying about AMD FidelityFX.

More AMD FidelityFX effects

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AMD FidelityFX Denoiser is a set of denoising compute shaders which remove artefacts from reflection and shadow rendering.

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The AMD FidelityFX SSSR effect provides an open source library to easily integrate stochastic screen space reflections into your game.

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AMD FidelityFX – Single Pass Downsampler

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Cauldron Framework

Radeon™ Cauldron is our open source experimentation framework for DirectX®12 and Vulkan®.

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