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PS光线调整技能

Photoshop Playbook: How to Adjust Lighting in Post Production using Photoshop

Photoshop Playbook 如何在后期制作过程中用Photoshop调整光线
Photoshop Playbook: How to Adjust Lighting in Post Production using Photoshop
光线是决定一张照片好坏的关键因素之一
Lighting is one of the key ingredients of a good photograph,
一般来说 Photoshop调整光线的作用是
and ordinarily Photoshop’s role with lighting,
来修正你在这个领域遇到的问题
is to correct problems that you’ve encountered in the field.
但是很多人会问我关于后处理重光照的问题
But a lot of people ask me about post-process relighting,
换句话说
in other words,
(就是)改变图像的光线
introducing lighting into an image.
所以我想用一张引人注目的图像来尝试
So I figured I would try an image that’s pretty dramatic.
我们来(把图像)从白天改成晚上
We’d go from day to night,
给图像植入一种新光源
and introduce a new light source into it,
我们可以通过许多技巧和诀窍来逐步调整
so that we can step through a lot of tips and tricks,
可以用Photoshop做到这些
for doing this in Photoshop.
我们来看看它是如何奏效的
Let’s take a look at how it works.
这是photoshop上的图像
Here’s our image in Photoshop,
我要做的
and what I want to do,
就是改变一天的时间
is change the time of day.
为了做这个
And in order to do that,
我只选择曲线调整层
I’m just gonna choose a curves adjustment layer,
这样的话 整个工作流程就不会遭到破坏
and this will allow me to have a non-destructive workflow,
我可以稍后就作调整
so I can change it later.
通过抓取左下角
By grabbing towards the lower left –
即那个影响阴影的区域
that’s the area that affects the shadows;
抓取得再高一点
by grabbing up higher –
影响美感
that affects the highlights,
而且我不想使阴影部分看上去有修剪的痕迹
and maybe I don’t want the shadows to be quite so clipped,
所以我将它们都提高
so I’ll bump those up.
我可以切换这里的眼睛按钮
I can toggle the eye here,
这样就好多了
and that’s much better.
(已经)从中午变成黄昏了
It’s gone from midday to dusk.
接下来 我要打开车头灯
And the next thing I want to do is turn on the headlights.
在此之前我要先选择灯光区域
So I’m gonna select the lights before doing that,
之后我们只需放大图像
and so we’ll just zoom in to our image here,
并选取快速选择工具既可
and grab our quick select tool.
有许多不同的选择工具
There’s a lot of different selection tools,
但这个很棒
but this is a great one,
它会很有用的
and it’s gonna work well,
因为我们已经在车头灯外取到了很好的光环
because we’ve got these nice halos outside of the headlights,
这有助于我圈定选择范围
which are going to help constrain my selection.
它不需要很完美
I don’t need it to be perfect,
因为灯光漏出了一点点
because light bleeds out a little bit.
我选了一个
So I select one,
再来选一个
let’s select the other one.
我可以选择Alt键 把选取的部分拖拽进来
I can option {Alt},drag to bring the selection back in,
之后 一旦把它靠近我想要的区域
and then once I have it close to where I want,
我将选择“重新定义选取边缘”
I’m going to choose Refine Edge,
它们悬空飘浮着 有点怪异的感觉
and they’re sort of eerily floating in space.
点击“智能半径”
I’m going to click Smart Radius,
通过扩大半径来优化选择
and increase the Radius just to make a little bit better selection.
看起来布满了边缘
It’s gonna look all around the edges,
然后我可以把它消除一点
and then I could smooth that out a bit,
也可以选择“Feather”
and I could also feather.
我想稍微使边缘再柔和一点
Again I kind of want to soften the edges,
因为灯光是趋向外照射的
because light does tend to bleed out a little bit.
当我满意时 就点确定
When I’m satisfied, I’ll click OK.
然后点击Command+C
And then I’m gonna hit Command+C,
这样 内容将复制到我的剪贴板
which is gonna copy that content to my clipboard;
然后Command+V
and Command+V,
这样就创建了一个副本
which is gonna create its own layer.
在副本上
And on that layer,
我们将用一种特效来打开车灯
we’re going to apply an effect to turn on the lights.
我并不经常使用这种特效
And the effect I want to use is one I don’t often use,
即镜头光晕
which is Lens Flare,
但事实上 对于这种特定用法的情况 其效果还是很完美的
but it’s actually perfect for this particular use case.
有许多不同类型的镜头光晕(可选)
There are a lot of different types of lens flare.
我发现最小号的应该是这个105 mm Prime
I find the sort of least extreme to be this 105 Prime.
我可以用这个亮度来试试
And I can play around with the brightness.
你只能在这上面看
You can barely see it on these,
但是有些十字线
but there’s a little crosshair,
我打算把它放在左灯正中心的位置
and I’m going to put that right in the center of the light on the left,
可能要把它调亮一点
and maybe brighten it up a little bit more.
点击ok
Click OK.
看起来非常棒
That looks pretty good.
我们马上来稍作调整
We’re going to tweak it in just a minute,
不过(在此之前)让我们先来打开另一盏灯
but let’s turn on the other light.
我们回到“镜头光晕”界面
We’ll go right back in there to Lens Flare.
我们把它从这一边移向另一边
We’re gonna move it from one to the other,
由于距离有点远
and since it’s a little further away.
我将亮度调低些
I’ll drop the brightness,
只调一点
just a little bit.
让图像看起来更逼真的关键
And the key to making this more realistic,
是混合模式
is the blend mode.
我发现把这个切换到点光模式
And I’ve found that switching this to pin light
能产生一个更可信的结果
gives a much more believable result.
如果我想降低点儿色调
Now if I wanted to tone that down a little,
(也是可以)做到的
I could do that.
也许我要调低不透明度
Maybe I’ll turn the opacity down,
只调低一点点
just a little bit.
接下来要做的
The next thing we want to do,
是使灯在车头灯的前方亮起来
is have the light shining beyond the headlights,
再来一次
and for that again,
返回这个背景层
I’ll just come back to this background layer.
缩小一点
Zoom out a bit.
找到多边形套索工具
And I find the Polygonal Lasso Tool,
这是达到这种效果的 很好的方式
is a really good way to do this.
关键要试着想一下
And the key here is to just try to think a little bit like,
灯是怎么发光的
how the light would shine,
不需要太完美
doesn’t have to be perfect.
点击灯外面的地方
I’m going to click outside of the light,
然后延伸
and stretch this out.
把它移到这儿
I’m going to move it over here,
离画布远一点
little ways further off canvas,
返回灯的顶端
come back up to this light towards the top,
或许还要过来一点
maybe come over a little,
向下照
shine this down.
我想稍微画一下这些线
And I’d like to make these crisscross a little,
因为那就是车头灯照射的区域
because that is how headlights work.
回到这一个
Come back up here to this one.
当我觉得满意的时候 把它连起来
When I’m satisfied, tie that over.
现在它看起来有点奇怪
And it looks a little weird right now,
但是我们接下来要做的 用这个选项
but what we’re gonna do is, with that selection,
选定曲线 你会发现
we are gonna choose Curves and you’ll see that
它自动创建了一个图层蒙版
it automatically created a layer mask,
我只是使它变亮
and I could just brighten that.
现在到了关键的时候了
Now you’re starting to get the idea:
那样的灯光似乎不像真的
that’s not quite believable.
但这时候能帮上大忙的是
But something that’s going to help quite a bit more is,
如果选中这个蒙版
if with that mask selected,
我们现在到 过滤器 模糊 高斯模糊
we now come up here to Filter/Blur/Gaussian blur
(这样)我们可以根据需要调节其清晰度
and we can blur that as much or as little as we want,
点击ok
and click OK,
然后应用
and apply that.
我们在那稍微退一下
So let’s just back up a little there,
差不多用过这些选项
and sort of toggle these.
光从那里发出来
So there’s light coming off of those.
就是车前灯自身
There’s the headlights themselves.
从晚上到白天
There’s night to day.
我们看一下开始
And just to see the beginning,
这是我们开始的地方
here’s where we started,
这是我们完成的样子
and here’s what we ended up.
只用了几分钟 我们就把照片做了很大的改变
In a couple minutes, we’ve taken the photo quite far.
现在我将做些不同的
Now what would I do differently:
我会用滤波器使灯光变暖
I might warm up the light with a photo filter.
增加多个图层蒙版
I might add multiple layer masks,
使中心的灯光更亮些
to make the light brighter in the center,
现在你学会这个方法了
but you get the idea.
事实上 你可以在几分钟之内
You can actually change an image, quite a bit,
把图修得相当好
in just a few minutes.
Photoshop PlayBook订阅去PS Playbook列表
Photoshop Playbook SubscribeGo to PS Playbook List

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视频概述

用PS调整光线,制作车灯打开关闭等效果。

听录译者

翻译译者

[B]白菜

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审核团V

视频来源

https://www.youtube.com/watch?v=cN7dQcBIx50

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