Use Project → Image Preview menu item to open image preview window.

• Changing the zoom of the image
• Preview in gray scale
• Transparent images can be previewed on selected background color

One can select between setting zoom in % of real size (the size will be actually real only if the dots per inch (DPI) is right set in your operating system). Other options are Fit to Window, Fit Width, Fit Height, Pixel-to-Pixel. The last option Pixel-to-Pixel allows you to see the accurate image that you will get by export in raster image format. The resolution of exported raster image is evaluated as a product of canvas size and DPI value specified in Canvas tab of Figure/Fit Plot Properties window.