The first successful permanent photograph was produced by Nièpce. He began experimenting with processes to set optical images in 1793. Some of his early experiments produced images, but they faded rapidly. He was said to have first produced long lasting images in 1824. The earliest known surviving example of a Nièpce photograph (or any other photograph) was created in June or July of 1827 (or 1826, according to some sources). Nièpce called his process "heliography", meaning "sun writing". It was a slow process which required perhaps some 8 hours of bright sunlight to affix the image; therefore it was used to photograph buildings and inanimate objects, but could not be used to photograph people.