Properties

Backdrop

Reference

Panel:Sidebar region ‣ View ‣ Backdrop
../_images/compositing_properties_backdrop.png

Backdrop options.

Backdrop Channels
Set the image to be displayed with Color, Color and Alpha, or just Alpha.
Zoom
Sets how big the backdrop image is.
Offset
Change the screen space position of the backdrop, or click the Move button, or shortcut Alt-MMB to manually move it.
Fit
Automatically scales the backdrop to fit the size of the editor.

Performance

Reference

Panel:Sidebar region ‣ Options ‣ Performance
../_images/compositing_properties_performance.png

Performance settings.

This panel help you to tweak the performance of the compositor.

Render
Sets the quality when doing the final render.
Edit
Sets the quality when making edits.
Chunk Size
Max size of a title (smaller values give a better distribution of multiple threads, but more overhead).
OpenCL
This allows the use of an OpenCL platform to aid in rendering. Generally, this should be enabled unless your hardware does not have good OpenCL support.
Buffer Groups
Enables buffering of group nodes to increase the speed at the cost of more memory.
Two Pass
Use two pass execution during editing: the first pass calculates fast nodes, the second pass calculates all nodes.
Viewer Border
This allows to set an area of interest for the backdrop and preview. The border is started by Ctrl-B and finished by selection of a rectangular area. Ctrl-Alt-B discards the border back to a full preview. This is only a preview option, final compositing during a render ignores this border.
Auto Render
Re-render and composite changed layer when edits to the 3D scene are made.