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This setting determines at what point the color or background image is activated during rendering.

In the example images below take note that while the In-Render and Pre-Composite types can look very similar, only In-Render is affected by depth of field and transmissive materials. All the while, Post-Composite is not affected by any camera effects.

Type: In-Render Pre-Composite Post-Composite
Car model by Luis Lara and Maxime Truchon
HDRI and Backplate by Apex Automotive

Affected by Bent Rays

This option is only available with the Type In-Render. If active, the background is rendered like a normal object in the scene and is therefore also subject to changes, e.g. when viewed through a refractive object or when rendered with blur. With this option turned off, the background is always rendered unchanged.

In the example images below notice how the background is bent by the transmissive glass sphere and car windows or blurred by depth of field when enabled. By comparison, the background is completely clear and the rays are not bent by transmissive objects when disabled, instead they pass right through and only the actual 3D scene is affected by these types of effects.

Affected by Bent Rays:
Enabled (default)
Disabled Enabled (default) Disabled


This is the plain color used in the background of the rendering.

Background Color: Black (default) White Image


An image loaded here replaces or covers the solid Color of the background. The selected Color may still be visible in the rendering if the background image does not cover the entire rendering (see Frame setting) or if the loaded Image has an alpha channel.

Alpha from Image

If the loaded background image contains an alpha channel, this can also be read out with this and thus makes the image transparent in the corresponding places or even cuts out entire image parts.


If you have loaded an Image for the background, this setting adjusts the scaling of the image in the rendering. This is only relevant if the width to height ratio of the image does not match the aspect ratio of the rendering:

Frame: Stretch Crop Fit

Offset X[-100..100%]

Allows you to move the background Image horizontally. In the areas that become free as a result, the plain background color becomes visible.

Offset X: -20 0 (default) 20

Offset Y[-100..100%]

Allows you to move the background Image vertically. In the areas that become free as a result, the plain background color becomes visible.

Offset Y: -25 0 (default) 10


Changing the Gamma value lightens or darkens only the midtones, without significantly affecting the highlights and depths. This means: Black remains black even after a Gamma change, white remains white.

Gamma: 0.5 1 (default) 2


All brightnesses of the loaded Image can be raised or lowered evenly.

Exposure: -2 0 (default) 2


This allows all color values of the loaded Image to be shifted evenly. The basis for this is a color ring on which all colors are applied. The color shift can then be specified via an angle between 0° and 360°. For this reason, a color shift of 360° also shows the original color values again.

Hue: 0 (default) 20 180


Use this value to lower or increase the color saturation of the loaded background Image.

Saturation: -100 0 (default) 100

Compensate for Exposure

If this option is turned off, the loaded background image will also be affected by the camera's Exposure settings.

Compensate for Exposure: 
Disabled (default)