您想要裁剪并专注于图片的特定区域有几个原因。这不仅可以让您摆脱周围的噪音，而且还可以改善图像的构图(improve an image’s composition)并总体上产生更强的视觉冲击力。一张巧妙裁剪的图片甚至可以完全传达一个不同的故事。
由于裁剪只涉及基本的图像处理，因此您可以使用任何照片编辑工具来完成这项工作。如果您可以使用Mac，则裁剪图片非常容易，因为 macOS 带有多个原生图像编辑器。
快速浏览
Quick Look是在(Look)Mac上查看图像的最快方式。这也是在Mac(Mac)上裁剪图片最快捷、最方便的方式。只需(Just)选择一个图像并按Space即可在(Space)Quick Look中打开它。然后，选择窗口顶部的铅笔形显示标记工具栏(Show Markup Toolbar )图标并选择裁剪(Crop)图标。
之后，使用图像周围的手柄来调整裁剪选择区域——如果需要，在拖动手柄的同时按住Shift以创建一个完美的正方形。(Shift )选择裁剪(Crop )按钮以裁剪所选区域。您还可以选择恢复(Revert )以撤消您的更改。
满意后，选择完成(Done)保存更改并再次按空格(Space )键退出快速查看。
预览
Preview是 Mac 的默认PDF和图像查看器，与(PDF)Quick Look相比，它具有一组出色的裁剪功能。
首先(Start)在Preview中打开图像。然后，选择铅笔形状的显示标记工具栏(Show Markup Toolbar )，并使用工具栏左侧的选择工具(Selection Tools)按钮从以下选择模式中进行选择：
矩形选择(Rectangular Selection)：创建一个标准的矩形选择区域。
椭圆选择(Elliptical Selection)：创建椭圆或圆形选择区域。
套索选择(Lasso Selection)：选择任何形状的区域。
智能套索(Smart Lasso)：通过自动捕捉场景周围的选择区域来选择和裁剪场景。(Select)
您可以选择稍后要裁剪的图像区域。如果您选择了矩形(Rectangular)选择或椭圆选择(Selection)模式，您可以按住Shift键创建一个完美的方形或圆形选择区域。
完成后，选择预览工具栏上的(Preview)裁剪(Crop )图标以裁剪图像。您的更改将自动保存。如果您使用Elliptical Selection、Lasso Selection或Smart Lasso模式，Preview将询问您是否允许将图片转换为PNG格式（如果它已经不是）以启用图像透明度。
相片
如果您想裁剪位于照片库(Photos Library)中的图片，照片(Photos)应用程序是最理想的选择。调出照片(Photos)后，选择要裁剪的图像，然后从窗口右上角 选择编辑。(Edit )
然后，切换到裁剪(Crop )选项卡并使用周围的手柄来指定裁剪区域。不要(Don)忘记按住Shift键来创建一个边相等的选择区域。
等待(Wait)几秒钟，照片(Photos)将自动裁剪图像。选择完成(Done)退出编辑(Edit)屏幕。如果您在Mac上启用了iCloud照片(Photos)，裁剪后的图像将同步到您的其他 Apple 设备(sync over to the rest of your Apple devices)。
注意：(Note:)当您在“照片(Photos)”应用程序中裁剪图片时，您始终可以稍后恢复为原始照片。为此，请选择编辑(Edit)（打开图像）并选择恢复为原始(Revert to Original)选项。
您还可以通过将照片导入照片应用程序来裁剪(Photos)照片库(Photos Library)之外的图像。选择文件(File )>导入(Import)来执行此操作。但是，由于(Due)Quick Look和Preview，除非您还想使用该应用程序的高级图片增强工具，否则没有理由这样做。
裁剪屏幕截图
您还可以在使用Mac拍摄后立即裁剪屏幕截图。按Shift + Command + 3截取屏幕截图。然后，选择屏幕右下方显示的屏幕截图的缩略图。
在显示的“快速查看”(Quick Look)窗口中，选择“裁剪(Crop )”图标，然后照常开始裁剪。最后，选择完成(Done )以应用并保存您的更改。默认情况下，裁剪后的屏幕截图将显示在您的桌面上。
截图
您还可以通过裁剪屏幕的特定区域来截取屏幕截图。只需(Just)按Command + Shift + 4即可调出剪切光标。然后，单击并将其拖动到要裁剪的屏幕区域上。
您始终可以选择屏幕右下角显示的屏幕截图缩略图，以便在快速查看(Quick Look)中进行进一步调整。
第三方裁剪工具
由于Mac提供了如此多的原生方式来裁剪图片和屏幕截图，因此您几乎不需要第三方编辑工具来完成如此简单的事情。尽管如此，我们还是浏览了Mac的(photo editors for the Mac)顶级截图工具(top snipping tools)和照片编辑器列表，并提出了一些值得注意的提及，它们应该可以帮助您轻松完成工作。
斯基奇(Skitch)
Skitch 是Evernote的一款免费工具，可让您编辑和标记图像。只需(Just)在应用程序中打开您要裁剪的图片，选择侧边栏上的裁剪(Crop )图标（其中还包含应用程序的所有注释工具），然后开始裁剪。
除了选择手柄，Skitch还允许您根据像素确定裁剪区域——将值添加到顶部的高度和宽度字段。
Skitch甚至允许您截取屏幕截图。选择菜单栏上的Skitch图标，然后选择(Skitch)Fullscreen Screenshot或Crosshair Screenshot选项。您还可以立即选择屏幕截图以裁剪它们。如果您想将图像上传到 Evernote，请不要忘记登录该应用(Don)程序(Evernote)。
Fotor Photo Editor是一个多平台的照片编辑工具，带有许多效果和调整工具来增强图像。该应用程序还可以快速轻松地进行裁剪。
只需打开一个图像，选择右侧窗格中的裁剪图标，展开(Crop )裁剪(Crop)部分，然后使用任何预设选择模式（自由格式(Freeform)、正方形(Square)、明信片(Postcard)等）来指定裁剪区域。然后，选择完成(Done)以裁剪图像。
作物作物
既然您已经了解了在Mac上裁剪图像的所有方法和工具，那么您最喜欢什么？在下面的评论中发出声音(Sound)。
How to Crop a Picture on Mac
There are several reasons why you would want to crоp and focuѕ оn a specific area of a picture. Not only does that allow you to get rid of the surrounding nоise, but it’s also pоssible to improve an image’s composition and create a stronger visual impact in general. A cleverly cropped picture can even relay a different story altogether.
Since cropping only involves basic image manipulation, you can use any photo editing tool for the job. If you have access to a Mac, it’s very easy to crop pictures since macOS comes with several native image editors.
Quick Look
Quick Look is the fastest way to view images on the Mac. It’s also the quickest and the most convenient way to crop a picture on Mac. Just select an image and press Space to open it in Quick Look. Then, select the pencil-shaped Show Markup Toolbar icon to the top of the window and pick the Crop icon.
After that, use the handles that surround the image to adjust the crop selection area—press Shift while dragging a handle to create a perfect square if you want. Select the Crop button to crop the selected area. You can also select Revert to undo your changes.
Once you’re satisfied, select Done to save the changes and press Space again to exit Quick Look.
Preview
Preview is Mac’s default PDF and image viewer, and it comes with a superior set of cropping features compared to Quick Look.
Start by opening the image in Preview. Then, select the pencil-shaped Show Markup Toolbar and use the Selection Tools button to the left of the toolbar to pick from the following selection modes:
Rectangular Selection: Create a standard rectangular selection area.
Elliptical Selection: Create an elliptical or circular selection area.
Lasso Selection: Select an area in any shape.
Smart Lasso: Select and crop scenes by automatically snapping the selection area around them.
You can select the area of the image that you want to crop soon after. If you chose the Rectangular Selection or Elliptical Selection modes, you can hold down the Shift key to create a perfect square or circle-shaped selection area.
When you’re done, select the Crop icon on the Preview toolbar to crop the image. Your changes will save automatically. If you use the Elliptical Selection, Lasso Selection, or the Smart Lasso modes, Preview will ask you for permission to convert the picture to the PNG format (if it already isn’t) to enable image transparency.
Photos
The Photos app is the most ideal if you want to crop a picture located within the Photos Library. After bringing up Photos, pick the image that you want to crop and select Edit from the top-right of the window.
Then, switch to the Crop tab and use the surrounding handles to specify the crop area. Don’t forget to hold down the Shift key to create a selection area with equal sides.
Wait for a few seconds and Photos will crop the image automatically. Select Done to exit the Edit screen. If you have iCloud Photos enabled on your Mac, the cropped image will sync over to the rest of your Apple devices.
Note: When you crop a picture in the Photos app, you can always revert to the original at a later time. To do that, select Edit (with the image open) and pick the Revert to Original option.
You can also crop images outside the Photos Library by importing them into the Photos app. Select File > Import to do this. Due to Quick Look and Preview, however, there’s no reason to do that unless you want to use the app’s advanced picture enhancement tools as well.
Crop Screenshot
You can also crop screenshots soon after you take them with your Mac. Press Shift + Command + 3 to take a screenshot. Then, select the thumbnail of the screenshot that appears in the lower-right of the screen.
On the Quick Look window that shows up, select the Crop icon, and start cropping as usual. Finally, select Done to apply and save your changes. By default, the cropped screenshot will appear on your desktop.
Snip Screen
You can also take a screenshot by cropping out a specific area of the screen. Just press Command + Shift + 4 to bring up the snipping cursor. Then, click and drag it over the area of the screen that you want to crop.
You can always select the screenshot thumbnail that shows at the lower-right corner of the screen to make further adjustments in Quick Look.
Third-Party Cropping Tools
Since the Mac comes with so many native ways to crop pictures and screenshots, you’ll hardly need a third-party editing tool for something so simple. Still, we went through our list of top snipping tools and photo editors for the Mac and came up with a couple of noteworthy mentions that should help you get the job done easily.
Skitch is a free tool by Evernote that allows you to edit and mark up images. Just open the picture that you want to crop in the app, select the Crop icon on the sidebar (which also contains all of the app’s annotation tools), and start cropping.
Besides the selection handles, Skitch also lets you determine the cropping area in terms of pixels—add the values to the height and width fields at the top.
Skitch even allows you to take screenshots. Select the Skitch icon on the menu bar and pick the Fullscreen Screenshot or Crosshair Screenshot options. You can also select your screenshots immediately to crop them. Don’t forget to sign in to the app if you want to upload your images to Evernote.
Fotor Photo Editor is a multi-platform photo editing tool that comes with a host of effects and adjustment tools to enhance images. The app also makes cropping quick and painless.
Just open an image, select the Crop icon on the right-side pane, expand the Crop section, and use any of the preset selection modes (Freeform, Square, Postcard, etc.) to specify the cropping area. Then, select Done to crop the image.
Crop Crop
Now that you know all the methods and tools to crop images on the Mac, what’s your favorite? Sound off in the comments below.
