HSB explanation

最新推荐文章于 2024-11-23 11:13:09 发布

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最新推荐文章于 2024-11-23 11:13:09 发布

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文章标签： scheme transition 360

本文介绍了HSB颜色模型的基本概念，包括色调(Hue)、饱和度(Saturation)和亮度(Brightness)三个维度的定义及测量方式。通过将这三个属性映射到一个倒置的锥形结构中，读者可以更好地理解HSB模型如何描述颜色。

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HSB: hue, saturation, and brightness

This scheme provides a device-independent way to describe color. HSB may be the most complex scheme to visualize, especially since color selection software has to reduce its three descriptive dimensions to two dimensions on the monitor screen. But once learned, it can be useful in many instances.

The easiest way to visualize this scheme is to think of the H, S, and B values representing points within an upside-down cone. At the edge of the cone base, think of the visible light spectrum (preceeding page), cut from the page and pasted into a circle with shading added to smooth the transition between the (now joined) red and magenta ends.

HSB color diagram, description follows

• Hue is the actual color. It is measured in angular degrees counter-clockwise around the cone starting and ending at red = 0 or 360 (so yellow = 60, green = 120, etc.).

• Saturation is the purity of the color, measured in percent from the center of the cone (0) to the surface (100). At 0% saturation, hue is meaningless.

• Brightness is measured in percent from black (0) to white (100). At 0% brightness, both hue and saturation are meaningless.

Brightness as it is described here refers only to relative values within a source that we are looking at (for example, a display screen or printed document). It is also called value or luminance. The distinction between levels of brightness is actually logarithmic, not linear as the HSB scale would imply.

原文地址 http://www.tomjewett.com/colors/hsb.html