ImageGear .NET v25.2 - Updated
Spotlights Effect
Developer Guide > How to Work with... > Image Processing and Cleanup > Advanced Image Processing and Correction > Image Effects > Spotlights Effect

The Spotlights Method darkens the image and highlights selected areas as if they are illuminated with a spotlight or sunlight. You can also use ImGearEffects.SpotlightsPreview Method for fast generation of a small preview of the effect.

Original Image Image with Spotlights Effect
 

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