您是否有一张照片想要保留主要焦点（主题），但删除其余部分？您不需要第三方照片编辑器(third-party photo editor)即可在 macOS 上执行此操作。相反，我们将向您展示在Mac(Mac)上从图像中删除背景的内置方法。
您可以使用“照片”(Photos)应用程序、“ Finder 快速操作(Finder Quick Action)”或“预览”(Preview)应用程序删除照片中的背景。每种方法都有局限性，因此请检查它们并看看哪种方法最适合您。
使用照片(Use Photos)删除图像背景
随 macOS Ventura引入，您可以删除图像的背景(remove the background of an image)，然后将剩余部分粘贴到您喜欢的位置。例如，您可以将其弹出到电子邮件或短信中。
- 在Mac上打开“照片”(Photos)应用程序，然后双击照片以将其置于更大的视图中。
- 右键单击(Right-click)图像并将光标移动到复制主题(Copy Subject)。执行此操作时，您会在照片中的拍摄对象周围看到一个白色的移动边框。然后，在菜单中
选择复制主题。(Copy Subject)
- 这会将图像放置在剪贴板上。选择要放置复制主题的位置。然后，在菜单栏中选择Edit > PasteCommand + V，或应用特定应用程序的粘贴操作。
- 然后您将看到粘贴的图像没有背景。
这种方法的好处是您可以毫不费力地删除图像背景并保持原始照片完整。但是，您确实必须将图像粘贴到某处，这可能并不总是理想的。
使用 Finder(Use Finder)删除图像背景
macOS Ventura的另一个更新是(Ventura)在 Finder 中(Quick Action in Finder)添加了快速操作来删除照片背景。
- 右键单击或按住Control并选择图像文件。然后，移至“快速操作”(Quick Actions)以显示弹出菜单。如果图像在文件夹中，您还可以在右侧
“预览”下方的工具栏中选择“更多”。(Preview)
- (Pick Remove Background)在菜单中
选择“删除背景” 。
- 如果您没有看到此选项，请选择“快速操作”(Quick Actions)列表底部的“自定义”(Customize)。
- 然后，选中“删除背景”(Remove Background)框并选择“完成”(Done)。然后，您将在“快速操作”(Quick Actions)列表中看到该操作。
- 选择“删除背景”快速操作(Remove Background Quick Action)后，您将看到在同一文件夹中创建的新图像，其中只有主题而没有背景。
此方法为您提供了另一种快速删除图像背景的(remove an image background)方法。唯一的缺点是它并不总是准确的。例如，您可能会错过最终产品中的部分主题，例如狗的尾巴或女孩的马尾辫。
使用预览(Use Preview)删除图像背景
如果您想在删除图像背景时更加精确，可以使用预览(Preview)应用程序。以下是在 Preview 中(in Preview)执行此操作的两种不同方法。
追踪主题
第一种方法允许您追踪要保留的部分，并使用智能套索(Smart Lasso)工具删除其余部分。
- 在“预览”(Preview)中打开图像，然后在工具栏中
选择“标记” 。(Markup)
- 选择“选择工具”(Selection Tools)按钮的下拉箭头，然后选择“智能套索”(Smart Lasso)。
- 画出(Draw)您想要保留的图片部分。这样做时，您会看到一条宽阔的红线，让您捕捉到所有您不想遗漏的小事情。
- 要完成边框，请将结束线连接到开始线。
- 如果要复制描画的图像部分，请在菜单栏中选择Edit > Copy您可以将图片粘贴到您喜欢的位置。
- 如果要删除背景，请选择工具栏中的“裁剪”按钮或(Crop)Edit > Invert Selection。然后，按删除(Delete)。
- 如果您使用的是JPG图像，系统会要求您将其转换为PNG文件格式以完成该过程。选择转换(Select Convert)以继续。
然后您将获得没有背景的图像。
按颜色删除区域
如果您的照片中的主题与背景颜色不同，则可以使用“预览”(Preview)中的“即时 Alpha”(Instant Alpha)工具。
- 在“预览”(Preview)中打开图像，然后在工具栏中
选择“标记” 。(Markup)
- 选择工具栏中的
“即时 Alpha”按钮（魔棒）。(Instant Alpha)
- (Drag)将光标拖动到背景区域的一部分上。预览(Preview)会选择该部分以及具有相同颜色的任何相邻区域。
- 当您释放光标时，这些将显示为突出显示或发光边框。
- 使用删除(Delete)键删除所选区域。
- 与上述方法类似，如果您使用的是 JPG(JPG)文件格式，系统会要求您将图像转换为PNG。
- 继续此过程，直到图像的所有背景都被删除。
提示：如果使用即时 Alpha(Instant Alpha)来选择主题而不是背景更容易，您也可以这样做。然后，选择Edit > Invert Selection并删除(Delete)以删除背景。
使用其中一种预览(Preview)方法的优点是您可以选择要保留或删除的图像的精确部分。然而，每种方法都可能需要一些时间才能得到您想要的结果。
完善您的照片
当您需要消除照片轰炸、模糊背景或主焦点后面不必要的干扰时，您可以使用这些选项轻松地从Mac上的图像中删除背景。
让我们知道您决定使用哪一种，或者您是否根据图像使用不同的照片编辑方法。
有关相关教程，请查看在 Mac 和 Windows 上使图像透明的(make an image transparent on Mac and Windows)方法。
3 Ways to Remove the Background From an Image on Mac
Do you have a photo where you’d like to keep the main foсus, the subject, but remove the rest? Yоu don’t neеd a third-party photo editor to do this on macOS. Instead, we’ll show you built-in ways to remove the background from an image on Mac.
You can remove the background in your photo using the Photos app, a Finder Quick Action, or the Preview app. Each method has limitations, so check them out and see which will work best for you.
Use Photos to Remove an Image Background
Introduced with macOS Ventura, you can remove the background of an image and then paste the remaining portion where you like. For instance, you can pop it into an email or text message.
- Open the Photos app on Mac and double-click the photo to place it in a larger view.
- Right-click the image and move your cursor to Copy Subject. When you do this, you’ll see a white, moving border around your subject in the photo. Then, select Copy Subject in the menu.
- This places the image on your clipboard. Choose the spot where you want to place the copied subject. Then, select Edit > Paste in the menu bar, use the keyboard shortcut Command + V, or apply the particular app’s paste action.
- You’ll then see your image pasted without its background.
The nice thing about this method is that you can remove an image background without effort and keep the original photo intact. However, you do have to paste the image somewhere, which may not always be ideal.
Use Finder to Remove an Image Background
Another update with macOS Ventura was the addition of a Quick Action in Finder to remove a photo background.
- Right-click or hold Control and select the image file. Then, move to Quick Actions to display the pop-out menu. If the image is in a folder, you can also select More in the toolbar below the Preview on the right.
- Pick Remove Background in the menu.
- If you don’t see this option, choose Customize at the bottom of the Quick Actions list.
- Then, check the box for Remove Background and select Done. You’ll then see the action in the Quick Actions list.
- Once you select the Remove Background Quick Action, you’ll see a new image created in the same folder with only the subject and no background.
This method gives you another fast way to remove an image background. The only downside is that it’s not always exact. For example, you may miss part of the subject in the final product, such as a dog’s tail or a girl’s ponytail.
Use Preview to Remove an Image Background
If you want to be more precise when you remove image backgrounds, you can use the Preview app. Here are two different ways to do this in Preview.
Trace the Subject
This first method allows you to trace the portion you want to keep and remove the rest using the Smart Lasso tool.
- Open your image in Preview and choose Markup in the toolbar.
- Select the drop-down arrow for the Selection Tools button and pick Smart Lasso.
- Draw around the part of the picture you want to keep. You’ll see a broad red line as you do so, letting you capture all of those small things you don’t want to leave out.
- To complete the border, connect your ending line to the beginning line.
- If you want to copy the part of the image you trace, select Edit > Copy in the menu bar. You can paste the picture where you like.
- If you want to remove the background, select the Crop button in the toolbar or Edit > Invert Selection. Then, press Delete.
- If you’re using a JPG image, you’ll be asked to convert it to a PNG file format to complete the process. Select Convert to continue.
You’ll then have your image without a background.
Remove Areas by Color
If you have a photo where the subject has distinct colors from the background, you can use the Instant Alpha tool in Preview.
- Open your image in Preview and choose Markup in the toolbar.
- Select the Instant Alpha button (magic wand) in the toolbar.
- Drag your cursor over part of the background area. Preview selects that section and any adjacent areas with the same colors.
- When you release the cursor, these then display with a highlighted or glowing border.
- Use your Delete key to remove the selected area.
- Like the above method, you’ll be asked to convert the image to a PNG if you’re using a JPG file format.
- Continue this process until all of the image’s background is removed.
Tip: If it’s easier to use Instant Alpha to select your subject rather than the background, you can also do this. Then, choose Edit > Invert Selection and Delete to remove the background.
The advantage of using one of the Preview methods is that you can select the precise portion of the image you want to keep or remove. However, each method can take some time to get exactly what you want.
Perfect Your Pictures
When you need to get rid of a photo bomber, blurred background, or unwanted distraction behind the main focus, you can easily remove the background from an image on Mac with these options.
Let us know which one you decide to use or if you use different photo editing methods depending on the image.
For related tutorials, look at ways to make an image transparent on Mac and Windows.
