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如何能从视频中提取出一幅静态图片 – 译学馆
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如何能从视频中提取出一幅静态图片

Photoshop Playbook: How to Get a Still Image From a Video

与以往相比 越来越多的人们开始
There are more people recording and sharing video
记录和分享视频
than any other time before.
我们常能见到人们使用
We’ve got people recording video
手机、数码单反拍摄视频
on their phones, on their DSLRs.
因此
And as a result
当我们在社交媒体对大家进行问卷调查
when we surveyed folks on social media and
询问他们最喜欢什么功能
asked what they’d like to see more of
有相当多的人表示他们最感兴趣的是
There was a tremendous amount of interest
用Photoshop编辑视频
in video editing in Photoshop,
特别是用Photoshop把静态的图片
specifically, things like extracting a still image
从视频里提取出来
from video using Photoshop
今天我要向你们展示如何操作
and today I want to show you how that’s done.
那么现在我们在Photoshop的“打开”对话框中
So here we are in Photoshop’s Open dialog
编辑视频与编辑图片同样简单 直接点击一个文件
and video support is as simple as just clicking on a file
将其打开
and it will open.
我们可以看到 播放流畅
As we can see, plays smoothly
然后我就可以对视频进行各种编辑了
and I can do all sorts of different things with the video.
我来给你们展示两种方法
But let me show you two ways
从你的视频里截取图片
to extract the still image from your video.
那么第一种方法 就像这样
so the first we begin just like that file
我们直接打开它
well we just go ahead and open it,
当我们打开它后
but once we’ve opened it,
这里有各种各样我可能想要截取的片段
there are all sorts of moments here I may wanna extract
那么 我就一会儿再选吧
so maybe I’ll choose later
我要做的是把鼠标放在这个小箭头上
What I wanna do is come down here to this little arrow
点击它
and click on that
这就打开了视频渲染面板
and that’s gonna allow me to render out the video.
我们来看看如何设置
So I wanna choose where I’m gonna put it,
我需要把Adobe媒体解码器切换成
I wanna switch from Adobe Media Encoder
Photoshop图像序列
to Photoshop Image Sequence.
选择我想要的文件格式
choose my file format maybe i wanna
我就选未压缩过的Photoshop文件
an uncompressed Photoshop document.
这里我能选择自己喜欢的尺寸
And I can choose my size,
虽然接下来我会用一种
although I’d deal with that in a slightly different way
稍有不同的方法来处理
in this next part.
现在我们来讲帧
And than we can talk about frame
显然这是694帧
now obviously 694 frames,
许多帧合在一起就成了视频
the frames pile up really quickly in video.
我现在并不准备一次把所有帧渲染出来
I’m not gonna render all of those out right now
但这不失为一种
But this is one way
批量截取视频中的图片的方法
to extract a bunch of stills from video.
如果你不确定你想要哪一张
If you’re not sure which one you wanna look at
这会是一个好方法
that would be a great way to go.
第二种方法
Another way to go
在菜单找到“导入”选项
would be to come down here to your Import dialog
选择“视频帧到图层”
and go to Video Frames to Layers
同样的思路 它只是让你能看到导入过程
Same idea. It’s just letting you visualize it on the import.
然后让我们选择这个风中的草地的视频
and so let’s choose this grass’s blowing in the wind here
然后看这个小的预览框
and look at this little preview dialog.
我可以播放它
I can play that
可以看到一开始没有太多的动静
and I can see that there’s pretty much no motion at the beginning,
然后会出现一些
and then a little bit.
我只想要这其中的一张
I just want one still from this image,
所以我要移动这个小箭头
so l’m gonna grab these little endpoints
在我进行操作的过程中 当我拖动完毕
and as soon as I do, and as soon as l let go
然后可以看到这个选项自动跳到“仅限所选范围”上了
then I’ll see that it’s automatically gone to Selected Range.
我们只挑出了这些选中的图层 就是这些帧
It’s selected just those layers, just those frames
并且它自动会把该段视频变成帧
and it automatically will make a frame from that animation.
如果我点击“确定”
So if I click OK
这七帧就会转换为七个图层
those seven frames as it works out will come in as layers.
我可以打开它们
I can turn those on
我希望它们看起来都完全一样
I expect them all to look pretty much exactly the same.
保险起见 因为我是在三脚架上拍摄的
Just to be safe because I was shooting on a tripod
按住“shift键”然后点击多选图层
I’m gonna Shift click those and
到菜单栏这里选择“编辑” “自动对齐”
I’m gonna come up here to Edit, Auto-Align.
对于当前这个例子来说这并不重要
Now it’s not as important with this particular clip
但如果我不是在三脚架上拍摄的
but if I weren’t on a tripod
那么对齐内容就真的很重要
then it will be really important to align that content
你会发现这对稳定视频图像很有效果
and you’d find that it will actually have the effect of stabilizing the video
因为它会对齐一个普遍的内容
because it will align common content.
现在我做完这些
Now that l’ve done that,
我要生成一个智能对象
I wanna make a smart object from that
来到菜单中“图层”选项
I’m gonna come to my Layer menu,
选“智能对象”再选“转换为智能对象”
Smart Object and Convert to Smart Object.
它周边会出现一圈选框
It’s just gonna put a wrapper around it.
有了周围的选框
With that wrapper around it,
我可以在“智能对象”选择“堆栈模式”
I can come up here to Smart Object, Stack Mode
这里有各种各样的
and I got all of these different ways
图像处理模式可选
of filtering that information.
如果我选择“中间值”
If I do Median,
我可能看不到太多的变化
I’m not gonna see too much from afar
但是它的作用就是
but what is going to do
去获取那些
is it’s gonna take any content
在半数以上图像中
that does not exist
都不存在的内容 并将其丢弃
in half or more of the images and throw it away.
所以如果在这一系列图像之中有一个路人走过
So if there was a person walking through the sequence
那这个人将消失不见
that person would vanish;
如果有噪点或杂色
If there was dust or noise
它们也会消失不见
that dust or noise will vanish,
所以我们将得到一个质量更好的静态图像
so we’re gonna get a better quality still.
那么我已经倾囊相授了
So now that I’ve done all that,
我要做的最后一件事也许就是
for last thing I probably wanna do is
把它变得尺寸更大或锐度更高
make it larger or sharper,
这两个操作有一个优点就是
and what’s great about both of those
它们内置了降噪功能
is they have noise reduction built into them.
我们看一下“图像大小”
Let’s just look at Image Size
它是1920乘1080像素
and it’s 1920 by 1080 pixels.
对于视频来说相当大 对于图片不算大
Pretty big for a video, not big for a still.
幸好有Photoshop
But luckily with Photoshop,
我可以高倍率放大图片 甚至可达百分之四百
I can make this a lot larger, even going to 400%
我可以看到它把一切处理的都非常完美
I can see that it holds together pretty well
并且如果我愿意 我可以选择“保留细节”
and if I want, I can go into Preserve Details
还可以对最后的成图进行降噪
and apply some noise reduction to the end result.
以上就是一些快速简单的方法
So couple of quick and easy ways
帮你从视频剪辑中提取静态图像
to resolve a still image from one of your video clips.

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视频概述

P图技术录播∶怎样从视频中获取一张静态图像

听录译者

4CObs

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AF

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视频来源

https://www.youtube.com/watch?v=tZup--tpyzk

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