ImageGear for C and C++ on Windows v19.10 - Updated
Lens Flare Effect
User Guide > How to Work with... > Image Processing and Cleanup > Special Effects > Lens Flare Effect

The IG_FX_lens_flare function applies a lens flare effect to the image. The effect simulates a bright light, such as the sun, and some reflections within the lens. It is typically used to add a sense of drama or realism to a photographic image.

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Lens Flare Effect