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SILENCE Blog » Blog 文章彙整 » [Lightroom 教學] Develop: Tone Curve
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SILENCE Blog

[Lightroom 教學] Develop: Tone Curve

2007, 10月 2 1:56 am

這次要跟大家分享的是 Develop 模組內的 Tone Curve 面板﹐相信有用在接觸影像處理軟體的人﹐對於圖片的「曲線」應該不陌生﹐Lightroom 裡的 Tone Curve 其實與一般軟體的曲線功能大同小異﹐只是有多了一些不同的調整方式。

tone curve panel
▲Tone Curve各部份說明圖

Tone Curve 的意義

首先大致介紹一下曲線的意義﹐X 軸和 Y 軸都表示照片的亮度值﹐不同在於 X 軸為照片原本的亮度值(等同於 Histogram 的 X 軸)﹐Y 軸為透過曲線對應之後的亮度值。因次我們可知此條曲線若為 45 度角的直線﹐則照片亮度不會變﹐因為 X值 = Y值。

而依照上圖﹐我們可以看見左上方有88/90%﹐代表著此點的X, Y軸數值﹐表示照片亮度為 88 之處﹐我們透過曲線的對應﹐調整此處至亮度 90。換句話說﹐照片亮部的地方會變得更亮了!解 Curve 意義後﹐就可以利用滑鼠拖曳曲線的方式﹐來調整曲線了 。

通常想要加強照片對比﹐可以將亮部區域往上調整﹐暗部區域往下調整﹐形成一條S形曲線。

最下方的 Point Curve 則用於調整曲線的彎曲程度﹐預設為 Medium Contrast。

4 個調整區域

我們可以發現﹐拖曳調整曲線時﹐並不是影響到整條曲線。而是會影響到特定範圍!Lightroom 稱之為 Region﹐將 Tone Curve 劃分為四個區域。依序為 Highlights(高光)、Lights(亮部)、Darks(暗部)、Shadows(極暗)。因此我們調整曲線時﹐只會影響特定範圍的(可以看上圖「影響範圍」處)。

但其實範圍也不是固定死的﹐可以藉由曲線圖下方的三角形符號﹐來調整四個區域影響範圍 :-) 如下圖「調整區域」所示。

adjust Tone Curve region
▲調整影響範圍

連動調整

各位可以發現﹐若用滑鼠拖曳調整曲線後﹐下方 region 的部份也會跟著移動。也就是可以利用滑鼠拖曳﹐或是直接使用下方 region 來調整曲線。雙方會互相連動。

在照片上直接調整

在第一個圖中﹐可看見左上角有個小圓圈符號◎﹐Lightroom 稱之為 Targeted Adjustment tool﹐可以利用此工具﹐直接在照片上做調整!

Targeted Adjustment tool
▲直接於圖上調整 Tone Curve

點選此工具後﹐於照片上往上或往下拖曳﹐即可調整。另外﹐我們並可以觀察到此滑鼠位置於 Tone Curve 上的位置。

調整完畢後﹐可以點選RGB值旁的按鈕「Done」 即可結束使用。

以上便是 Tone Curve 面板的相關功能﹐若有錯誤或不清楚請大家踴躍提出喔!

非經同意﹐請勿任意轉載內容及圖片!

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