如何刪除microsoft office文件中擷取的螢幕截圖中未使用的部分？

當您將螢幕截圖新增到Microsoft Office文件並對其進行裁剪時，很可能不會進一步考慮未使用的部分，但您是否知道這些部分仍然存在，並且如果它們包含敏感資訊，可能會帶來安全風險？今天的超級使用者問答幫助一位憂心忡忡的讀者只保留了所需的部分截圖，而永久性地去掉了其餘的截圖。...

當您將螢幕截圖新增到Microsoft Office文件並對其進行裁剪時，很可能不會進一步考慮未使用的部分，但您是否知道這些部分仍然存在，並且如果它們包含敏感資訊，可能會帶來安全風險？今天的超級使用者問答幫助一位憂心忡忡的讀者只保留了所需的部分截圖，而永久性地去掉了其餘的截圖。

今天的問答環節是由SuperUser提供的，SuperUser是Stack Exchange的一個分支，是一個由社群驅動的問答網站分組。

問題

超級使用者讀者user462760想知道如何阻止Microsoft Office在文件中保留截圖中未使用的部分：

I made a worrying discovery that after cropping a screenshot in Word, PowerPoint, and likely other Microsoft Office programs, the unused parts of cropped screenshots are retained. This has made me fairly paranoid as I frequently take screenshots and crop them to show the relevant piece of information before sending the documents off to others.

I had assumed that when I saved a document, the unused porti*** of cropped images were discarded, but looking at work from years ago, I can still uncrop the unused parts of the images to view the original screenshots in their entirety.

Is there a way to disable this? This seems like a ridiculous security flaw.

有沒有辦法阻止Microsoft Office在文件中保留截圖中未使用的部分？

答案

超級使用者貢獻者Steven為我們提供了答案：

Delete Cropped Areas of a Picture

Even after you crop parts of a picture, the cropped parts remain as part of the picture file. You can reduce the file size by removing the croppings from the picture file. It is also a good idea to do this to help prevent other people from viewing the parts of the picture that you have removed.

Important: This cannot be undone. Therefore, you should only do this after you are sure that you have made all the crops and changes that you want.

1. Click the picture or pictures that you want to discard unwanted information from.

2. Under Picture Tools, on the Format tab, in the Adjust group, click Compress Pictures.

Note: If you do not see the Picture Tools and Format tabs, make sure that you selected a picture. You might have to double-click the picture to select it and open the Format tab.

3. Under Compression Opti***, select the Delete cropped areas of pictures check box. To remove croppings for the selected picture or pictures only and not all of the pictures in the file, select the Apply only to this picture check box.

Tip: For more information about reducing the file size of the pictures and compressing pictures, see Reduce the file size of a picture.

Source: Delete cropped areas of picture (Crop a picture or a shape with a picture fill) – Microsoft

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