The largest digital image in the word is 8,6 Gigapixels and was digitised in Santa Maria delle Grazie's Church in Italy. The image represents the work 'Vita di Cristo' (Life of Christ) and it is a mosaic of 1.145 images with 12,2 megapixel resolution each.
To see the digital image on the web visit:
http://haltadefinizione.deagostini.it/