The image is 1,600 times stronger than a typical digital camera image
The image is 1,600 times more detailed than those taken with a typical 10 million pixel digital camera.
Experts will be able to see segments as though just centimetres away and examine otherwise unavailable details.
The posting comes amid claims a new system aimed at protecting the piece from Milan's pollution is not working.
The work is displayed in the Italian city's Church of Santa Maria delle Grazie.
Peeled off
Art curator Alberto Artioli told Associated Press news agency the new resolution avoided the graininess when zooming in to regular photographs.
It is visible at www.haltadefinizione.com.
"You can see how Leonardo made the cups transparent, something you can't ordinarily see," he said. "You can also note the state of degradation the painting is in."
That degradation has been the subject of controversy this week.
An Italian newspaper, Corriere della Sera, reported that a sophisticated monitoring and filtration system introduced during a restoration of the chapel in the late 1990s was not preventing particles or substances that could damage the work being brought in by visitors.
The Last Supper was painted by Leonardo da Vinci at the end of the 15th Century and, because of the experimental techniques he used, parts of the masterpiece subsequently peeled off and were badly damaged.
The BBC's Frances Kennedy says the paper reported that equipment monitoring air quality inside the refectory showed that levels of fine particle pollution had tripled in the past two years.
It quoted experts suggesting these particles could settle on the work, eventually creating a dark misty layer.
However, Milan's cultural commissioner said the threat was non-existent.
More than 350,000 people visit the painting each year.
La Última Cena



Los internautas ya pueden consultar el cuadro de "La Última Cena" del italiano Leonardo Da Vinci en alta resolución. Esta iniciativa ha sido obra de una empresa de digitalización de imágenes llamada HAL9000 en honor al ordenador asesino de la película "2001: Odisea en el Espacio", de Stanley Kubrick. El proyecto empezó a gestarse a principios de este año.

En  su página web han colgado una imagen de 16 billones de pixels de la pintura, lo que permite analizar al milímetro todos los recovecos de esta obra de arte. En concreto, supone mil seiscientas veces más nítida que las imágenes tomadas con una cámara digital de 10 millones de pixels. Se puede analizar con todo detalle los trazos y pinceladas del dibujante.

El director general de HAL9000, Vincenzo Mirarchi, declaró el pasado jueves que el motivo que llevó a la empresa a subir la imagen a su página web es el de "facilitar una forma innovadora de apreciar el arte, más que potenciar las especulaciones sobre su significado".

Desde este mismo website los usuarios pueden adquirir además Gaudenzio Ferrari, Vita di Cristo y Andrea Pozzo, Gloria di Sant'Ignazio, de 8'6 y 9'8 gpixels, respectivamente.