The Atmosphere Render Element stores only atmospheric or volumetric participating media such as Environment Fog or Aerial Perspective.  This render element can then be used to enhance or color-correct just the atmospheric component of the image during the compositing process.

When atmospheric effects or fog is included in a scene, they will render into the Beauty (RGB color) channel, and should also be output as the atmosphere channel for compositing use.

The parameters for this render element appear in the V-Ray RenderChannelColor render channels node.

Denoise – Enables the render element's denoising, provided the Denoiser render element is present.

Consider for Anti-Aliasing – When enabled, anti-aliasing will be used where possible.

Filtering – Applies the image filter to this channel. Image filter settings are in the Image Sampler tab of the Sampler tab of the  V-Ray Renderer node.

Color Mapping – When enabled, the Color Mapping options in the render settings will be applied to the current render channel.

Derive Raw Channels – Generates data in the raw channels by combining the respective color and the filter color channels.

VFB Color Corrections – Applies the post render color adjustments made from the VFB.

Atmosphere Render Element, with fog
generated by EnvironmentFog

Original Beauty composite

Color of atmosphere changed and intensity increased