Heliography process
The contact process of heliography (1822)
In 1822, Joseph Nicéphore Niépce achieved the first photographic image that could be permanently fixed: a copy of an engraving, produced through direct light contact on a bitumen-coated metal plate.
It was not the first photograph in the world in today’s sense – but it was proof that light can permanently inscribe an image into matter.
This process – the contact process of heliography – is the oldest known functioning photographic process. It did not arise from a desire to depict the world, but from a practical goal: to mechanically copy prints without having to engrave them by hand.
The contact process
The oldest surviving photograph in the world (1827)
My reconstruction
In the summer of 1827, Joseph Nicéphore Niépce pointed a camera obscura out the window of his study at the Le Gras estate in Saint-Loup-de-Varennes, France, and exposed a bitumen-coated pewter plate for several days.
What resulted is the oldest surviving photograph in the world: Point de vue du Gras – a view over the courtyard in which the sun appears to shine from both left and right at once, because it moved across the sky during the days-long exposure.
The image is now held at the Harry Ransom Center at the University of Texas at Austin. It measures 16.5 × 21 cm, is fixed on a pewter plate, and shows – depending on the viewing angle – either a negative or a positive. It exists once. There is no copy.
My reconstruction with the camera