- Pertaining to a photoconductor which undergoes an increase in electrical conductivity when exposed to light. Also called light-positive.
- Pertaining to that which undergoes an increase in a given property when exposed to light, or which otherwise has a positive response to light.
- An image, such as a photographic image, in which the light and dark areas are the same as the scene the image is taken from. Also called positive (5), or positive image.