gamma 色彩飽和度

Explained in very simple terms, "gamma" is a measurement that describes a digital device’s representation of light intensity. Digital devices do not deliver or record light intensity in a linear fashion, but on a curve: gamma expresses the degree of that curve, or its deviation from a straight line. This is not a limitation of technology, but of evolution: the human eye does not respond linearly to brightness either, and our digital devices are trying to compensate for that fact.

用非常簡單的術語解釋，“伽馬”是一種描述數字設備光強度表示的度量。 數字設備不是以線性方式傳遞或記錄光強，而是在曲線上傳遞：伽瑪表示該曲線的程度或其與直線的偏差。 這不是技術的限制，而是技術的發展：人眼也不會對亮度做出線性響應，我們的數字設備正在努力彌補這一事實。

Gamma does not affect pure white or black, but mid-tones: a higher gamma value will make images appear darker overall, and a lower one, lighter.

灰度系數不會影響純白色或黑色，但會影響中間色調：較高的灰度系數值會使圖像整體看起來更暗，而較低的灰度系數會更亮。

For years this was a major issue between Macs and PCs when it came to visual representation: Apple had the default gamma set to 1.8, while Microsoft insisted on a default value of 2.2 in Windows. As a result, a fine print photograph that looked fine on a Mac would tend to appear dark on a PC, and an image transferred from PC to Mac would often look washed-out and over-bright. Historically, each value has had its adherents and detractors: 2.2 gamma has higher contrast and more support (digital television transmissions in North America have a gamma of 2.2, as does the sRGB color space), but 1.8 was useful for the first generations of desktop publishing, and many feel that it has more subtle shades and tones. (And they are not the only options: digital cinema uses a gamma of 2.6).

This issue has now finally been resolved: Apple capitulated, and from Snow Leopard (OS X 10.6) on, the Apple operating system has the same gamma as Windows. Images created on older versions of OS X brought forward into Snow Leopard may appear slightly darker as a result. This change also means that images will tend to remain steadfast in color, and not appear lighter or darker as they move across platforms.

現在，這個問題終于得到解決：Apple屈服了，從Snow Leopard(OS X 10.6)開始，Apple操作系統的伽瑪與Windows相同。 結果，在雪豹中使用舊版OS X創建的圖像可能會顯得有些暗。 這種變化還意味著圖像將趨于保持穩定的顏色，并且在跨平臺移動時不會顯得更亮或更暗。

Of course none of this compensates for the fact that people miscalibrate their own computer monitors all the time, but there’s nothing we can do about that.

當然，這些都不能彌補人們一直在校準自己的計算機顯示器這一事實，但是我們對此無能為力。

進一步閱讀 (Further Reading)

If you would like to to learn more than you would ever want to know about gamma, Norman Koren’s site is the definitive resource. (So much so that I’ll even forgive his use of Comic Sans).

如果您想了解更多關于伽瑪的知識， Norman Koren的網站就是您的權威資源。 (以至于我什至會原諒他對Comic Sans的使用)。

翻譯自: https://thenewcode.com/385/Color-for-Web-Designers-Understanding-Gamma

gamma 色彩飽和度

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