Unity組件：Contrast Enhance 對(duì)比度增強(qiáng)

The Contrast Enhance image effect enhances the impression of contrast for a given camera. It uses the well-known unsharp mask process available in image processing applications.

對(duì)于一個(gè)特定的相機(jī)，對(duì)比度增強(qiáng)特效可以增強(qiáng)其生成圖片的對(duì)比度感知。它主要使用了圖像處理領(lǐng)域中著名的非銳化掩膜方法來(lái)達(dá)到這種效果。

When blurring is applied to an image, the colors of adjacent pixels are averaged to some extent, resulting in a reduction of sharp edge detail. However, areas of flat color remain relatively unchanged. The idea behind unsharp masking is that an image is compared with a blurred (or "unsharp") version of itself. The difference in brightness between each pixel in the original and the corresponding pixel in the blurred image is an indication of how much constrast the pixel has against its neighbours. The brightness of that pixel is then changed in proportion to the local contrast. A pixel which is darker after blurring must be brighter than its neighbours, so its brightness is further increased while if the pixel is darker after blurring then it will be darkened even more. The effect of this is to increase contrast selectively in areas of the image where the detail is most noticeable. The parameters of unsharp masking are the pixel radius over which colors are blurred, the degree to which brightness will be altered by the effect and a "threshold" of contrast below which no change of brightness will be made.

當(dāng)向一張圖片是用模糊化特效時(shí)，臨近像素間的顏色將會(huì)被平均，這也就減少了銳利邊緣的細(xì)節(jié)信息，但擁有平滑顏色過(guò)度的區(qū)域則相對(duì)地保持不變。非銳化掩膜的核心思想這是將一張圖片與其自身的模糊化效果相比較，對(duì)于同一個(gè)像素來(lái)說(shuō)，原始圖像中的顏色與其在模糊化后圖像的顏色差異，則表示該像素在其臨域內(nèi)具有多大的對(duì)比度。這樣，就可以根據(jù)局部對(duì)比度來(lái)成比例地改變?cè)撓袼氐牧炼�。如果一個(gè)像素在模糊化后變得比原來(lái)暗，那說(shuō)明該像素要比其臨域內(nèi)其他像素的顏色要亮，所以增強(qiáng)后其顏色會(huì)更亮，同理，如果該像素模糊后比原來(lái)亮，則增強(qiáng)后會(huì)變得更加暗。這種特效可以用來(lái)有選擇地增加圖像的對(duì)比度，特別是針對(duì)那些需要關(guān)注的細(xì)節(jié)。非銳化掩膜方法的參數(shù)有像素的模糊半徑，增強(qiáng)系數(shù)以及對(duì)比度閾值，在此閾值之下的亮度將不受影響。

As with the other image effects, this effect is only available in Unity Pro and you must have the Pro Standard Assets installed before it becomes available.

跟其他圖像特效一樣，該特效只能用于Unity Pro版本中年，而且你在使用它之前需要安裝Pro Standard Assets。

No Contrast Enhance 沒(méi)有對(duì)比度增強(qiáng)特效

Contrast enhance enabled 使用對(duì)比度增強(qiáng)特效

Properties 屬性

• Intensity 強(qiáng)度
  The intensity of contrast enhancement. 對(duì)比度增強(qiáng)的強(qiáng)度
• Threshhold 閾值
  The constrast threshold below which no enhancement is applied.
  對(duì)于閾值以下的像素將不進(jìn)行增強(qiáng)處理
• Blur Spread 模糊擴(kuò)散
  The radius over which contrast comparisons are made.
  在該半徑下將進(jìn)行對(duì)比度的比較

Hardware support 硬件支持

This effect requires a graphics card with pixel shaders (2.0) or OpenGL ES 2.0. PC: NVIDIA cards since 2003 (GeForce FX), AMD cards since 2004 (Radeon 9500), Intel cards since 2005 (GMA 900); Mobile: OpenGL ES 2.0; Consoles: Xbox 360, PS3.

該特效要求在擁有像素著色器（3.0）或OpenGL ES2.0的顯卡上進(jìn)行。PC：2004年以后的NVIDIA卡（GeForce6），2005年以后的AMD卡（Radeon X1300），2006年以后的Intel卡（GMA X3000）；移動(dòng)設(shè)備：OpenGL ES2.0；控制臺(tái)：Xbox360，PS3。

All image effects automatically disable themselves when they can not run on end-users graphics card.

所有圖像特效如果不能在用戶(hù)終端的顯卡上運(yùn)行時(shí)則會(huì)自動(dòng)關(guān)閉。