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This section allows you to load an image and use it as a background for your render.

Opacity – Determines the opacity of the layer.

Color – When enabled, sets a color value as the background.

Image – When enabled, loads a file that is going to be used as a background.

Stretch – Control the aspect ratio of the image by stretching the image to fit the VFB.
Fit – Keeps the aspect ratio of the image. Enlarges or shrinks the VFB to fit the image.
Fill – Keeps the aspect ratio of the image and cuts some parts of the picture to fill the VFB.

Horizontal Offset – Controls the background image position by the X axis.

Vertical offset – Controls the background image position by the Y axis.

As foreground – When enabled, the image loaded in the Image field is used as a foreground. This means that the image is on top of the render and you are able to see the render only if the image has an alpha channel.

Save in image – When enabled, saves the Background layer to the image.

Color Transformation – This dropdown allows display corrections to be applied to the Background layer independently.

Auto – Recognizes what the desired transformation would be based on the image suffix (_srgb, _lin_srgb, _acescg...) and sets those settings automatically.

Manual – Allows manual setup of the color transformation options. The options can be left at Auto and be determined automatically by V-Ray. The options can be set to None and apply no transformations.

RGB color space – Choose which color space to use for the color transformations. sRGB is the color space for most monitors and computer displays. ACEScg allows for greater range of color transformations in post. It has a wider gamut of colors than the sRGB linear gamut.
Transfer function – Alters the pixel values to a new range. Gamma 2.2 is the standard for most monitors.

OCIO – Allows an Input color space to be selected when an OCIO profile is already loaded. OCIO profiles can be loaded either through the Display Correction layer.

Input color space – Determines the input color space for the background image; normally, this is a linear color space as V-Ray internally works in that space.