最终触摸：UW图像的后生产（第3部分：基本调整，对比度和曲线）

扁平图像共享一个常见的问题：一世nsufficient contrast。

当然，防止对比度问题的最佳方法是“在摄像机中”，基本上是通过拍摄图片时正确的方式来做。但是，有些图像还不错，可以通过轻微的对比度调整来改进。同样，RAW或DNG是要使用的理想文件格式。

在抓住对比度滑块或操纵曲线之前Photoshop's ACR (Adobe Camera Raw) or Lightroom, a general understanding of what contrast is helps us make a fine post production that gives an already good image the final kick.

In photography, contrast is the difference between dark and light; the larger the difference between dark and light areas, the greater the contrast. In very simple words, boosting the contrast in digital postproduction turns bright areas of an image brighter and dark areas darker. The same counts for colors and tones. Everything is about light.

数字后生产的对比度增加，应使用非常柔和的步骤仔细而微妙地进行。过度使用会破坏图像。

现在，让我们看一下浮潜时在红海中拍摄的快照：

快速白平衡很轻微暴露校正将上述图像更改为以下图：

However, even though the image now appears more colorful, it still looks sort of "flat"- obviously a contrast problem. Let's see how we can fix that!

The easiest way is by using the contrast slider in ACR orLightroomthat is placed directly below the exposure slider. Moving the slider to the left reduces contrast, while moving it to the right increases it. And yes, extreme alterations cause extreme results.

Let's have a look at two extremes:

您可能会相信，将对比度滑块移至Max（+100）大大改进了图像，但是，尽管我们可能增加了对比度并使图像看起来“更好”，但实际上我们产生了很多新问题。

As a simple rule of thumbs: do not overuse it. Always take subtle steps and fine adjustments and always keep your eyes open for the finest details in bright areas, dark areas, and in colors too.

Not convinced yet? Well, then you'll need to face my "contrast horror show" as a cautionary example:

All pictures in the above image are completely ruined by adding too much contrast. Bright tones went brighter, dark tones went darker, colors morphed into psychedelic. The results are terrible, even though they might now have maximum contrast.

后意识到,“很多帮助的概念lot" might be not be the ideal way to go here, let's take a critical look at what went wrong in the tutorial image after boosting contrast:

区域1和2：我们几乎失去了阴影的所有细节。

Zone 3: we lost details in the bright tones.

区域4：黄色被剪裁。

区域5：水的颜色看起来不现实。

结论，随着对比滑块增加了图像的整体对比，结果可能看起来“更好”作为第一个视图，但是当查看细节时，我们应该 - 我们的眼睛遇到了很多错误。

For demonstration purposes, I've used extreme examples, of course. However, whatever you do, always slide the contrast very slightly... or don't move it at all, as we can use curves for a way finer contrast adjustment :-)

曲线是多功能，强大和科学的。因此，我只指曲线改变可以采取什么行动来改善对比度。修改曲线是添加对比度和制作图像弹出的最强大的工具，比对比度滑块更好。此外，曲线的改变是调节色调以使色调变亮，变暗，变化的最佳工具，并将您的图像变成“更好的不吃这类蘑菇”的现代艺术;--)

通过单击右上角（第二个图标）的“音调曲线”骑手，可以在ACR中找到曲线控件。在Lightroom中，在右边的“基础”一章下方找到了它们。

[Left: Tone Curve control in Lightroom. Right: ACR]

由于这里有很多选择，因此您可以选择其中一个预设（线性，中间或强对比度），然后从那里进行良好的调整。还有很多选择，但是对于初学者来说，我会保持简单。

The classic way to improve contrast is the "S" curve, where- after your alterations- the diagonal line in the curve controls window ends as an "S" shape. A more pronounced S-shape gives a greater effect to the image's contrast, and makes the image pop.

通过应用“强对比度”预设并稍微移动曲线中的点以进行精细调整，图像现在看起来像这样：

In the end, always check the results of postproduction closely and carefully; the devil hides in the details! Curves might look a bit difficult to understand and use at the beginning, but they provide much finer and accurate options to improve contrast of an image than the contrast slider. The good ol’ "S" curve is a great place to start with! :-)

进一步阅读

继续阅读Part 4 - Colors

回到第2B部分 - 高级曝光

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