View full size: When checked, image will display in full size (without stretching). If not checked, image will fill and center proportionally on the full preview window

Repeat image: If checked, the image will be drawn repeated 3 times in both horizontal and vertical directions. This can be used to fine-tune repeating backgrounds, or to help spot margins

Margin: If checked, will add a margin from the window border to the image

Background color: Change the window background, for better viewing

Zoom values: Zooming

Save to file: Save the current file to an external image file