The term alternative process refers to any non-traditional or non-commercial photographic printing process. Currently the standard analog photographic printing process is the gelatin silver process, and standard digital processes include the pigment print, and digital laser exposures on traditional color photographic paper.
Alternative processes are often called historical, or non-silver processes. Most of these processes were invented over 100 years ago and were used by early photographers.
Many contemporary photographers are revisiting alternative processes and applying new technologies (the digital negative) and practices to these techniques.
- Gum bichromate and other Pigmented Dichromated Colloids which are used to directly generate a photographic print
- Platinum Process and Palladium Process
- Carbon print and various similar processes which use a non-sensitive intermediate layer to generate a photographic image
- Van Dyke Brown, Cyanotype and various other iron-based processes
- Wet and Dry Plate processes based in silver using a hand coated emulsion on a tin or aluminum (tintype) or glass (ambrotype) base
- Resinotype and several similar processes which rely upon unexposed dichromated colloids to accept an insoluble pigment
- Inkodye, a light-oxidized vat dye.
- Oil Pigment processes, such as Bromoil Process
- Other processes which use silver halide but in various different ways other than the typical silver-gelatin formula, such as Salt Print
- Any number of processes which use more exotic materials, such as uranium chloride, gold chloride, and any number of other salts to directly or indirectly generate a photographic print
- Non standard digital manipulation or printing.
These schools and photography centers offer a variety of alternative process workshops and classes.