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PS中的降噪功能介绍 – 译学馆
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PS中的降噪功能介绍

Photoshop Playbook: Noise Reduction in Photoshop

Photoshop玩转手册Ps中的降噪处理
数字摄影已经发展很久了
Digital photography comes a long ways
不仅相机越来越高级
not only your cameras are a lot better
图像更大 像素更高
producing larger files with more pixels
像素本身的质量也越来越好了
but the quality of the pixels are better themselves
所以 图像噪点 不像以前一样是个大问题
and so things like noise aren’t as much of an issue as they used to be
不过 处理图像的时候 噪点总还是存在的
but often times when you edit the files, you will see noise in them
接下来 我就带你了解 如何利用Photoshop有效地去除噪点
so I wanna show you how to effectively remove noise using Photoshop
现在 在Photoshop界面 这张图片看起来还不错
so here we are in Photoshop, and our image looks pretty good
我选择“缩放”工具 双击放大图片
if I take my Zoom Tool and double click on it
看起来还是挺好的 尽管背景很暗
still looks OK even though it’s a dark setting
但是待会儿打开这张图片的时候
but as we’ll see in just a moment as we begin to open it up
就会发现一些问题
we’re gonna see some problems with the file
我们将要用Camera Raw软件去处理这张图片
and to edit it, we’re gonna use Camera Raw
如果你用的Photoshop是Photoshop CC之前的版本
now, if you are using a version of Photoshop before CC
图片是RAW文件的话 就直接用Camera Raw打开
if it’s a raw file, it’s just gonna open in Camera Raw
图片不是RAW文件的话
if it’s an non-raw file
记住 你需要设置Photoshop去打开这个文件
remember you need to train Photoshop to open the file
所以 在Photoshop里面
so you wanna go into Photoshop
“偏好设置”—“文件设置”
Preferences-File Handling
“Camera Raw 偏好设置”
Camera Raw Preferences
设置它打开JPEG和TIFF格式文件
and ask it to open JPEGs or TIFFs
我用的是CC版本 所以我直接在这里
I’m in CC here, so I’m just gonna come up here to
选择“滤镜”—“Camera Raw滤镜”
Filter-Camera Raw Filter
我们能看到问题是
and we’ll see that the problem is
在我们调高细部和阴影的时候
as soon as we start opening up the details and shadows here
出现了很多噪点
then I’m creating a lot of noise
大量噪点隐藏在这张图片里
there’s a lot of noise hiding in this file
现在要锐化图片
now as we sharpening
先要确保放大图片至少到100%
you wanna make sure that you zoom in to at least 100%
或者200% 就是现在这样
maybe even 200% as I have here
处理噪点的时候
when we editing noise
我点到“锐化”面板
I’m gonna come over the same panel that I would sharpen for
这里有两种噪点
and let’s talk about the two types of noise that we have here
一种是有色噪点 表现为黑色区域的一些斑点
there is color noise, which in the black area with that sort of splotchy
蓝紫色的噪点
blue purple noise
还有更松脆的亮度噪点
and then there is the crunchier luminance noise
我会展示怎么去除这两种噪点
I’m gonna show you how to get rid of both of those
我们可以直接把有色噪点抹掉
the color noise, we can just wash that away
黑色的区域会变得整洁
and you see the black area just gets cleaned up
并且我们可以保留这里的光晕和霓虹灯
and remarkablely we’ve even preserved the halo and the neon light here
对于亮度噪点
now with the luminance noise
你需要更小心一点
you need to be a little bit more careful
因为你可以去除它
because you can get rid of it
但是如果全部去除
but if you are gonna get rid all of it
图像会有点看起来像油画
the image is gonna start to look a bit like a painting
所以我会去除部分
so I go somewhere between
移动这个小滑块来调节你要去除的程度
move your Detail slider to get more or less
最后有个小技巧
and let me show you one last trick with this
可以主动去除噪点
there is actively removing the noise
它藏在这儿
and then there is hiding it
如果我回头来看这张图
so if I backup and look this image
有色噪点和很多亮度噪点已经被去除了
I can see we got rid of that distracting color noise and a lot of the luminance noise
如果我想把剩下的也去除
but if I wanna get rid of the rest
大部分都藏在阴影里
most of it’s hiding in the shadows
如果我移动黑色的滑块
so if I take the Blacks slider
把它往回拉
and pull that down
我可以隐藏很多噪点
I can hide a lot of the noise that’s in there
所以将降噪
so a combination of noise reduction
和参数的调节相结合 效果会比较好
and using the right sliders will give you a great result
回到photoshop
back here in Photoshop
看一下整体 效果不错
I’m just gonna move back and that looks a lot better
还有两个很重要的降噪操作
now there are two other areas where you can reduce noise that are really important
图像大小和锐化 它们是怎么发挥作用的呢
Image Size and Sharpening, let’s take a look at how those work
在图像大小的面板里 需要勾选“保留细节”
so, in Image Size, if I would come in here to Preserve Details
我可以把图像变大
I can see that I can make my image larger
这也可以降噪
and I can also Reduce Noise
这个逻辑
this is a really similar logic
跟Camera Raw很相似
to what we saw on Camera Raw
如果你的版本在cc之前 可以在 camera raw 内进行操作
again if you are prior to CC, you wanna do this in Camera Raw
如果你的版本是cc或在cc之后 你可以在图像尺寸的面板里调节
if you are CC or later, you can do this in Image Size dialog
在智能锐化中也有类似的操作
you’ll find similar controls in Smart Sharpen
对于所有的锐化操作
in addition to all of the sharpening controls
里面也有一个降噪的滑块
you also have a nice Reduce Noise slider in here
以上 就是降噪的一些常用方法
OK, so there is a lot of great ways to get rid of noise
有一个看起来似乎可以降噪的操作
there is one place that you would think you can get rid of noise in Photoshop
但是最好别用
that you don’t wanna use
在滤镜中选择噪点 降噪
and that’s up here in Filter-Noise-Reduce Noise
这听起来挺靠谱的
I know that sounds like that be a great spot to go
曾经它确实如此
and years ago it was
但是软件都是跟camera相关的 最好直接从camera raw
but the software is of all with the cameras, and the best place to do it
智能锐化 尺寸 去进行调节
is in the Camera Raw, Smart Sharpen or Image Size
希望对你有所帮助
I hope that help so

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视频概述

在ps中通过camera raw,智能锐化和图像大小这三种方法去降噪。

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翻译译者

皮卡秋秋秋

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视频来源

https://www.youtube.com/watch?v=J9_K8ZMfXys

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