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After Effects Compositing Essentials: Color Keying (Lynda)
色鍵，也被稱為色度鍵，讓你拍攝的前景現(xiàn)場(chǎng)，并把它插入到幾乎任何背景;這樣可以節(jié)省你的錢，讓你創(chuàng)造投籃機(jī)會(huì)是不可能的，或高度危險(xiǎn)采取的單桿。它是有效的，關(guān)鍵在于細(xì)節(jié)。在這個(gè)過程中，馬克·克里斯蒂安森展示了如何在After Effects制作故事片品質(zhì)按鍵適合以及在他們的新場(chǎng)景，同時(shí)保留了微妙的細(xì)節(jié)，無(wú)論是股毛或軟或半透明的邊緣，這使結(jié)果可信。

與鍵控過程的簡(jiǎn)要說(shuō)明開始，馬克帶你穿越參與創(chuàng)建一個(gè)完美的綠屏關(guān)鍵的步驟：產(chǎn)生粗糙無(wú)光，消除色彩溢出和霧面線，和煉油問題的邊緣。他演示了如何使用按鍵光和Primatte，二者缺一不可鍵控工具工作在After Effects，并說(shuō)明何時(shí)使用一個(gè)比其他。而對(duì)于在綠屏將無(wú)法正常工作時(shí)，他展示了如何生成高對(duì)比度遮罩，或亮度鍵，根據(jù)視頻中的亮度數(shù)據(jù)。最后，了解壓縮和如何來(lái)準(zhǔn)備打一槍換鍵控。

Color keying, also known as chroma keying, lets you shoot a foreground scene and insert it into virtually any background; this can save you money and allow you to create shots that are impossible or highly dangerous to take as a single shot. For it to be effective, the key is in the details. In this course, Mark Christiansen shows how to produce feature-film-quality keys in After Effects that fit well within their new scenes, while retaining the subtle details—be they strands of hair or soft or translucent edges—that make the results believable.

Beginning with a brief explanation of the keying process, Mark takes you through the steps involved in creating a perfect green-screen key: generating a rough matte, eliminating color spill and matte lines, and refining problematic edges. He shows how to work with Keylight and Primatte—two indispensable keying tools in After Effects—and explains when to use one over the other. And for times when green screen won’t work, he shows how to generate high-contrast mattes, or luma keys, based on the luminance data in your footage. Last, learn about compression and how to prep a shot for keying.

課程內(nèi)容包括：
什么是顏色鍵控？
使用垃圾遮罩
入門按鍵光
了解屏幕色彩，剪輯黑色和白色夾子調(diào)整
消除溢油高級(jí)泄漏抑制
使用的主要清潔自動(dòng)細(xì)化邊緣
除以抵抗遮罩了磨砂
打破一個(gè)復(fù)雜的色鍵
制作亮度鍵與提取物
設(shè)置天空更換
使用瑞風(fēng)軟磨砂改善邊緣細(xì)節(jié)
羽化邊緣與道殘影
不知何時(shí)，以避免綠色屏障
預(yù)備出手的鍵控