A canvas is a [surface] on which [commands] are rendered to output an image or [drawing]. The output result can be exported to some file formats. (See also the topic "Serializing a widget".)

Raster images:

• Bitmap
• Pixmap
• TIFF
• PNG
• XPM
• BMP
• Img
• Capture a window into an image

Vector files:

• Postscript
• PDF
• SVG
• XSL-FO
• VML
• WMF
• CGM
• DXF
• CAD

More interesting formats can be seen on the page "http://wikipedia.org/wiki/Graphics_file_formats".

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