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# Bloom
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The **Bloom** effect makes bright areas in your image glow. To do this, it creates fringes of light that extend from bright areas in your image. This simulates the effect a real-world camera gives when light overwhelms the lens.
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The Bloom effect also has a **Dirtiness** feature, which you can use to apply a full-screen layer of smudges or dust to diffract the Bloom effect.
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### Properties
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**Bloom** settings:
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| Property | Function |
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| :---------------- | :------------------------------------------------------------ |
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| Intensity | Set the strength of the **Bloom** filter. |
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| Threshold | Set the level of brightness to filter out pixels under this level. This value is expressed in gamma-space. |
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| Soft Knee | Set the gradual threshold for transitions between under/over-threshold (0 = hard threshold, 1 = soft threshold). |
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| Clamp | Set the value for clamping pixels to control the **Bloom** amount. This value is expressed in gamma-space. |
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| Diffusion | Set the extent of veiling effects in a screen resolution-independent fashion. |
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| Anamorphic Ratio | Set the ratio to scale the **Bloom** vertically (in range [-1,0]) or horizontally (in range [0,1]). This emulates the effect of an anamorphic lens. |
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| Color | Select the color of the tint of the **Bloom** filter. |
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| Fast Mode | Enable this checkbox to boost performance by lowering the **Bloom** effect quality. |
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**Dirtiness** settings:
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| Property | Function |
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| --------- | ----------------------------------------------------- |
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| Texture | Select a Dirtiness texture to add smudges or dust to the lens. |
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| Intensity | Set the amount of lens dirtiness. |
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### Details
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With properly exposed HDR scenes, the `Threshold` should be set to ~1 so that only pixels with values above 1 leak into surrounding objects. Lower this value when working in LDR or the Bloom effect won’t be visible.
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### Performance
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Lowering the `Diffusion` parameter will make the effect faster. The further away `Anamorphic Ratio` is from 0, the slower it will be. Enable `Fast Mode` if you are developing for mobile or low-end platforms to get a significant boost in performance.
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Lower resolution lens dirt textures result in faster lookup and blending across volumes.
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### Requirements
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- Shader model 3
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