Contrast (vision)
Contrast (vision)
Contrast in the context of vision refers to the difference in color and light between parts of an image. It is a key aspect of visual perception and is used in a variety of applications, including photography, film, and medical imaging.
Pronunciation
/kɒntrɑːst/
Etymology
The term "contrast" comes from the Latin word "contrāstāre", which means "to stand against". In the context of vision, it refers to how different elements of an image stand out against each other.
Definition
In vision, contrast is defined as the difference in luminance or color that makes an object (or its representation in an image or display) distinguishable. In other words, contrast is the difference in visual properties that makes an object (or its representation in an image or display) distinguishable from other objects and the background.
Related Terms
- Luminance: The intensity of light emitted from a surface per unit area in a given direction.
- Color contrast: The difference in color between two adjacent elements.
- Contrast sensitivity: The ability to detect differences in luminance between two or more parts of a field of view.
- Contrast ratio: The ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing.
- Contrast enhancement: Techniques used in imaging to increase the contrast between different parts of the image.
Applications
Contrast plays a crucial role in many areas, including:
- Photography: Photographers use contrast to highlight the subject of their photos and to create a certain mood or atmosphere.
- Film: Filmmakers use contrast to create visual interest and to guide the viewer's attention.
- Medical imaging: In medical imaging, contrast is used to differentiate between different types of tissues and to highlight abnormalities.
See Also
External links
- Medical encyclopedia article on Contrast (vision)
- Wikipedia's article - Contrast (vision)
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