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title: "Sample Rate"
canonical: "https://documentation.chaos.com/space/VBLD/117637906/Sample%20Rate"
format: markdown
---
This page provides information about the Sample Rate Render Channel in V-Ray for Blender. Overview The Sample Rate Render Channel displays the work being done by the image sampler as a red, green, and blue image. This render channel displays the process while rendering is done and once the render completes. A color is assigned to each pixel acco rding to how many primary samples are being taken by the  Image Sampler : The  Blue  channel contains the areas that reached the desired image quality with few primary samples. The  Green  channel shows areas that require more antialiasing (AA) samples to clean up than the Blue areas but managed to achieve the  Noise Threshold  within the number of AA rays used. The  Red  channel contains the parts of the image that didn't reach the desired quality threshold, as they got to the maximum amount of AA rays before reaching the  Noise Threshold . If the Image Sampler type is  Progressive , the  White  areas will represent the areas the sampler is currently working on, as they were found to not satisfy the  Noise Threshold  as of yet. The way to ensure a render is correctly computed is to minimize the amount of red color in this render channel. Raising secondary sampling through any means will reduce the primary sampling work in the corresponding areas, effectively moving red areas into green ones and green ones into blue ones. Lowering secondary samples per pixel will do the opposite, potentially leading to more red areas. The suggested way to minimize the red color and optimize render times is to increase the  Max Subdivs  value (if the previous render was still noisy) or increase the  Noise Threshold  value (if the previous render was clean but took too long to complete). Note that some specific image features, like high-frequency detail often found in fur and hair or high-contrast zones, will likely always try to reach the maximum sampling, so some red will appear there. This is perfectly normal and doesn't slow down the rest of the rendering while ensuring the problematic parts of the image clean up as per the user's settings. UI Path:  ||V-Ray Node Editor|| >  World  >  Render Channels  >  Utility  >  V-Ray Sampler Rate Properties See the  Render Channels  page to find out where you can find these properties. Channel Name  – Customizable name for the render channel. Enable Deep Output  –  Specifies whether to include this render channel in deep images. Color Mapping  –  Consider For Anti-Aliasing  – When enabled, anti-aliasing is used where possible. Filtering  – Applies an image filter to this channel. Vfb Color Corrections  – Applies the post-render color adjustments made from the VFB. Denoise  – Enables the render channel's denoising, provided the  Denoiser  is enabled.