A painting technique in which small dots of color are applied to a canvas to form an image is known as which of the following?

Fresco is a technique of mural painting on freshly laid wet plaster, allowing the paint to become an integral part of the wall. Unlike Pointillism, which uses dots of color, fresco relies on broad brush strokes and the blending of pigments with water to create images.

Illusionism refers to the technique of creating the illusion of three-dimensionality on a flat surface, often through perspective and shading. This approach focuses on realistic representation rather than the use of color dots, distinguishing it from Pointillism.

Trompe l'oeil is a visual art technique that uses realistic imagery to create the optical illusion that depicted objects exist in three dimensions. While it can involve meticulous detail like Pointillism, it does not utilize the dot technique specifically.

Wash is a technique that involves applying a thin, transparent layer of paint over a surface, allowing underlying layers to show through. This method is typically used for creating soft color transitions and does not involve the precise dot application characteristic of Pointillism.