'Entire image introduction' presentation slideshows

Porthole: A spatial interface to provide scrolling, zooming-in, and zooming-out

Porthole: A spatial interface to provide scrolling, zooming-in, and zooming-out. A successful answer. A main screen to display part of the image. A sub window to display the entire image. Introduction. H ow do you see a L arge I mage within a L imited S creen?.

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