Please refer to the resources to find out why Talbot is called the founder of modern photography.

Inventor of silver iodide photographic paper photography.

Karoshi photography is the basis of modern photography, and it is the first application of the modern photography term "positive film" or "negative film". Talbert's technique is to coat paper with silver chloride, then stick it on the board and expose it for more than ten minutes. Silver powder appears in the light-sensitive place, which is black, and the unexposed place is still the color of paper. This is equivalent to our negative today. Then, he printed it according to the negative. This is equivalent to the principle of most film cameras today. Daguerre's technology is different. He makes the color of light appear in the photosensitive area, which is more like the principle of Polaroid instant camera. Therefore, at the earliest time, in fact, Daguerre used more instant photography technology than negative film technology, because photos can be obtained instantly. However, because the backboard was not preserved and could not be reprinted, it was gradually abandoned by people, and negative films became the mainstream.