Contrast (vision)

（重定向自Contrast threshold）

Left side of the image has low contrast, the right has higher contrast.

Changes in the amount of contrast in a photo

An image of the Notre Dame cathedral as seen from the Eiffel Tower

The same image, with added global contrast, and local contrast (acutance) increased through unsharp masking.

Contrast is the difference in luminance or colour that makes an object (or its representation in an image or display) distinguishable. In visual perception of the real world, contrast is determined by the difference in the color and brightness of the object and other objects within the same field of view. The human visual system is more sensitive to contrast than absolute luminance, we can perceive the world similarly regardless of the huge changes in illumination over the day or from place to place. The maximum contrast of an image is the contrast ratio or dynamic range.

单词	Contrast threshold
释义	Contrast threshold 英语百科 Contrast (vision) （重定向自Contrast threshold） Contrast is the difference in luminance or colour that makes an object (or its representation in an image or display) distinguishable. In visual perception of the real world, contrast is determined by the difference in the color and brightness of the object and other objects within the same field of view. The human visual system is more sensitive to contrast than absolute luminance, we can perceive the world similarly regardless of the huge changes in illumination over the day or from place to place. The maximum contrast of an image is the contrast ratio or dynamic range.
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