As a positive process is the totality of all techniques in photography refers to the generation of a positive photographic image used. In the positive process, the material changes according to the degree of brightness and the color of the light: dark becomes dark, light becomes light.
Important positive procedures
The most important early positive photographic processes include:
- Self- printing by nature (around 1500), including by Thomas Walgenstein (self-printing of plant leaves by nature).
- [Unnamed] (around 1770), early photographic attempts by Thomas Wedgwood
- Heliography (around 1826–27), Joseph Nicéphore Niépce
- Daguerreotype (1839), Louis Daguerre