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The VFB is much more than a render image holder window. The new enhanced version provides a higher level of post processing adjustments and ability to modify your scene from inside the VFB. Here is a list of old and new benefits you should know:

• Image preview:
  Loads render elements channels via a dropdown list;
  Works with display corrections;
  Loads various 8bit and 32bit file formats, including V-Ray resumable files;
  Image comparison between 2 or 4 renders;

• Image management:
  Keeps the rendered image in full 32-bit floating point format;
  Can store history of rendered images with their post rendering corrections;
  Can save corrected output to various image formats;

• Image editing and post processing:
  Set Color Corrections to rendered image and its elements;
  Composite mode for Back to Beauty workflow including layers corrections;
  LightMix control on lights contribution in the rendered image;
  Applying Proportion Guides on the rendered image;

• Scene editing:
  Can modify actual lights values by transferring updated intensity and color from LightMix mode;
  IPR camera navigation and focus control from inside VFB;

• Render management:
  Denoiser control;
  Region rendering control;
  Allows you to choose the order in which the buckets are rendered;
  Automatic render resolution adjustment in IPR when the VFB window is resized;

To use the VFB for rendering, create a V-Ray Renderer node.

VFB also has some limitations which are listed in the Notes section below.