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给照片换一片天空

Photoshop Playbook: How to Add a New Sky -- Compositing Basics

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Photoshop 教程如何给照片换天空——图片合成基础
[Photoshop PlaybookHow to Add New Sky – Compositing Basics]
合成 就是将两张或多张图片合并在一起
Compositing, which is really the combination of the two or more images,
这是Photoshop的核心
is really the core of photoshop.
通过使用“选区”“蒙版”“图层”和“混合”
Using “Selections”, “Masks”, “Layers”, and “Blending”
我们可以完成一些让人难以置信的事情
We can do some pretty incredible things.
我想给你们简单介绍一下如何做这些
So I wanna just give you a quick primer on how to do this.
在这个例子中 我们将替换一张图片的背景
And in this case, we’ll swap the background of one image.
你自己做则想改多少张就改多少张
But you could use as many images as you want.
在这里 我们有一张前景图片
So here we have a foreground image,
我们准备把它的天空替换掉 而关于用于替换的天空
and we’re gonna go ahead and swap the sky. And for the sky,
我选择另一张图片
I’ve chosen this other image.
我想使用这张图片的顶端部分
We wanna use the top half of this one.
你可以用不同的图片进行比较
And you’ll sort of want to compare your images
确保前景和背景能匹配
and make sure that they are going to work together.
首先 我注意到 我喜欢图中的鸟
One of the first things, I notice, is I like the birds,
我也喜欢这个天空 但是这只鸟有点大
and I like the sky, but this bird’s kind of big,
当我把它与前景合并时 看起来会很奇怪
that’s gonna look strange when I drop that in there
那么 我要做的就是
so, what I’ll do,
选取这个部分
is I’ll select that,
大家都知道的 photoshop
and, knowing photoshop,
我觉得“内容感知填充”
I think that Content-Aware Fill
在这张图片中可能会出现一些问题
might bump into some problems on this image
与选区相邻的区域有很多内容
There’s a lot of neighbouring content
都有可能被替换到选区
that it might pull in there.
我可以试一下 按删除键
I can try it, I hit Delete,
起作用了 我决定就用它了 其实感觉还不错
and it works, I will use it, and that’s actually all right.
但如果这样不起作用 我教你一个变通的方法
If that doesn’t work for you, let me show you a workaround.
选区仍然是一样的
With that same selection,
点击这里 “补丁工具”
come over here to your “Patch tool”,
确定这里设置的是“内容感知”
make sure that that’s set to Content Aware
然后只要拖动它
and then just drag it over,
你可以选择从哪个区域得到样本内容
and you can choose which area you want to sample content from.
一旦你松开鼠标 选定的内容就会被填充到选区
once it’s dropped that content in there,
记得你也可以把这里改成“非常宽松” 看起来还不错
remember that you can change it from the “Very loose” which looks pretty good,
改成“非常严格” 这样就会精确地复制
to “Very strict”, which will copy it exactly.
我还是喜欢我们第一次做的效果
I liked it where we first came in,
也就是“宽松”的那种
which was loose
这样的效果挺好
that works just fine.
好了 现在需要用到两个快捷键
All right, now, a couple short cuts.
首先 我要演示的命令是“Ctrl+A”
First one I’ll show you is “Command+A”
用来选择整张图片
to copy the entire image.
下一个快捷键是“Ctrl+C” 这个你大概知道
Next one is “Command + C”, which you probably know.
是用来复制你所选择的部分
that’s going to copy what we’ve selected.
我们回到前景的文件
We move over our foreground,
然后点击“Ctrl+V” 把背景放进去
and hit “Command + V” to drop that in.
你将会注意到 它是作为一个图层被放进来
And you’ll notice, it’s dropped it in as a layer.
当我输入快捷键“Ctrl+T”
When I hit “Command + T”,
就可以来变换图层了
to transform that.
在这一步有一个很重要的要点
And this part is really important.
那就是确保你在拖动锚点时要按住“Shift”键
Make sure you hold down the “Shift” key, while you’re dragging that,
以确保图片的比例不会改变
so that the proportions don’t change.
我们把宽度调整到与前景图片一致
When I get that about the width of our image
我们把它往上拉
and let’s pull this up,
那么接下来我们将做什么 我们要降低图片的不透明度
And then what we are going to do is, we gonna fade the Opacity
这样我们可以看到地平线是如何相匹配的
so we can see how our horizon lines are matching up.
看起来相当不错
Looks pretty good,
我们再把这个稍微拉大一些
then pull this one so it’s a little bit
再低一点
lower.
好的 很好
OK, that’s great.
如果有需要的话 我会把不透明度再调低
I can keep that Opacity turned down if it’s helpful.
我想看清需要擦除的区域
I want to see the area that I’m gonna cut through.
确认转换 我们将在这里添加一个蒙版
Commit that transform and we’re gonna add a mask over here.
我需要按下这个按钮
So I’m gonna come down to this button,
加一个蒙版
and add a mask
使用蒙版的关键是使用正确的笔刷
and the key to using a Mask is having a correct Paint Brush.
黑颜色的笔刷可以擦除图片
A black Paint Brush will cut through that,
让我们来到这里 确保我们的颜色选择器设置为黑色
so let’s come over here, make sure our Colour Picker is set to black.
点击笔刷 确保模式为“正常”
Take a Paint Brush, make sure that’s set to Normal.
我可以使用“Ctrl”+“Option”
I can use the “Control”+”Option”
或者“Ctrl”+“Alt”键
or “Control” + “Alt” keys,
来调整笔刷到合适尺寸
to get the right size,
我仅仅想要擦除
And I’m just gonna cut through
内容重叠的部分
the overlapping content.
随着逐渐靠近地平线 我需要更加小心
And as I get closer of the horizon, I wanna be careful
注意后面的图片是什么
of what’s back there…
如果我想 我还可以拉近镜头
I can zoom in a little bit more if I want.
就这样用笔刷涂抹
Just painting through there.
通过不断调整不透明度
by playing around with your Opacity
以及一点点的练习
and a little bit of practice
应该就可以得到一个相当好的结果
should be a little get a pretty decent result.
当你满意了 你就可以点击备份
And when you like it, you see, back up
打开不透明度
and crank the Opacity up.
整体来说 我喜欢目前的效果 我可以关闭这个图层看看 我已经改变了相当多
And overall I like the look of it, I can toggle that, and see that I’ve changed it, quite a bit.
在这个部分 我可能选择更精细一点
At that point, I might, choose to refine it just a little bit more
沿着边缘
along the edges.
但是有一件事 依然困扰着我
But there is one thing, it’s still bothering me,
那就是颜色不一样 我们的前景是这样的暖色调
and that’s that the colour is just different, we’ve got this warm cast of the foreground,
但是我们的新背景的颜色
and we got the slightly different colour,
有一点不一样
on the new background.
所以我们要选中背景的图层
So with that layer selected,
然后点击这里进入“过滤器”
I’m gonna come up here to my Photo Filter,
我可以选择一个暖色过滤器 这儿有好几种暖色过滤器
and I’m gonna choose a Warming Filter, got a couple of them.
我要增加它的密度
And I’m just gonna increase the Density.
直到得到我想要的效果
untill I get the look that I want.
我们再次关掉背景图层
So again, if I toggle that layer,
可以看到修改前后有很大差异
I can see a pretty significant difference there.
不仅仅是你的蒙版精细度匹配得很好
It isn’t just the fidelity of your “Mask”,
背景贴图的颜色也匹配得很好
It’s the texture on the colour, matching as well.
这就是我们介绍给您的一些小技巧
So there you get a few tips that
关于“图层”
introduce you to “Layers”,
“蒙版” “混合”以及“选区”
“Masking”, “Blending” and “Selections”.

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视频概述

Photoshop图片合成基础教程,关于“图层”“蒙版”“混合”和“选区”命令的一些使用技巧。

听录译者

没有如果

翻译译者

鞋子

审核员

审核团1024

视频来源

https://www.youtube.com/watch?v=NZHNQZv-Otk

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