The Best Preview Render (or BPR) will render a model in Edit mode using high quality anti-aliasing at the full document size. Use of the AAHalf button is not necessary when using this rendering mode. BPR will render all SubTools, with polyframes displayed if that is activated and also provides several new render options including subsurface scattering and fibers effects.
The main BPR controls, including the BPR button, are at the top of the Render > BPR RenderPass sub-palette. The BPR button and SPix slider are also at the top right of the default UI.
Saving the BPR Render to a file
To save a render simply press the Document > Export button and choose a file name and extension. Images can be saved in a variety of formats. If you want to save different passes then these will be available in the Render > BPR RenderPass sub-palette. Click on an icon to export that pass.
To learn more about BPR see the following pages: