几十年来，平板扫描仪(Flatbed scanners)一直是图像数字化的支柱。问题是你可能没有，而且几乎可以肯定你一直都没有。
今天的智能手机相机非常好，您不仅可以拍摄非常详细的文档照片，还可以放大到墨点。那么我们为什么还要使用扫描仪呢？
好吧，您的相机应用程序只是没有与扫描仪软件相同的功能。幸运的是，您可以使用大多数人可能不知道的应用程序中的简洁工具将文档扫描到Google 云端硬盘！(Google Drive)
这与拍摄文件有何不同？
文档扫描仪相对于智能手机照片的最大优势不是细节或质量。事实上，扫描仪以精确的方式保存文档，并在每次扫描时提供完美、一致的照明。此外，它捕捉的图像完全垂直于纸张。
当您用手机拍照时，页面可能会变形，周围显示一堆不需要的物体并且光线不足。手动纠正所有这些问题将花费大量时间和精力。如果您想要看起来接近平板扫描仪所达到的结果，那就不好了。
谷歌(Google)利用其软件开发人才快速、几乎自动地弥补了智能手机摄像头扫描的缺点。
你需要什么
要使用Google 云端硬盘(Google Drive)应用程序扫描到Google 云端(Google Drive)硬盘，您需要以下内容：
- 运行Android(Android)或 iOS的智能手机或平板电脑（带摄像头）
- 一个谷歌帐户
- 具有良好照明的平坦表面
- 您要扫描的页面、书籍或其他文档
- 互联网连接
如果您已获得此列表中的所有内容，我们已准备好引导您完成从手机扫描到Google 云端硬盘的过程。(Google Drive)
如何使用手机扫描到Google (Google Drive)Drive(Your)
假设您已经安装了Google Drive应用程序并登录到您的Google帐户，以下是扫描文档的方法：
- 首先打开应用程序，然后选择用于创建新文档的加号图标。(plus icon)
- 在选项中，您会看到扫描。选择扫描(Scan)继续。
- 现在您将看到这个扫描界面，它向您显示相机所见内容的实时视图。
- 定位(Position)您的文档，然后在取景器中对齐。您不必填满窗口，也不必非常精确。如果您的手机有多个单元，您可以选择在不同的相机之间进行选择。主摄像头通常是最佳选择。
点击大的白色快门按钮(white shutter button)以扫描页面。
- 现在您将看到这张照片的预览。如果它看起来不错，请选择OK。如果没有，请选择重试并重(Retry)试。
- 现在您有机会调整扫描的页面。选择返回按钮(back button)重新拍摄照片。选择调色板(color palette)以将图像从黑白更改为彩色。
- 右边的下一个按钮将旋转图像，最后一个按钮是裁剪功能。但是，这个“裁剪”功能实际上可以让您仔细检查Drive在页面周围自动做出的选择。如果出现错误，拖动节点以正确跟踪页面。(nodes)
- 如果您只有一页要扫描，您现在可以选择保存按钮(Save button)，但如果您想添加更多页面，请选择加号(plus sign)并重复上述步骤，直到您扫描完文档的所有页面。
现在，系统会要求您将文档另存为PDF 格式(PDF)到您的Google Drive帐户中。给它一个名字，选择它应该保存在哪个谷歌帐户下，然后为它选择一个位置。(Google)
我的文件在哪里？
当您首次使用Google 云端硬盘(Google Drive)应用扫描文档时，您正在创建手机存储本地的扫描。如果您使用WiFi连接，该扫描将自动上传到您指定的任何Google Drive文件夹。(Google Drive)根据您的应用设置，上传也可能通过移动数据进行，但默认情况下，云端硬盘(Drive)会等待WiFi，然后再将手机中的任何文件上传到云端。
这也意味着在您连接到WiFi(WiFi)之前，您将无法与任何人共享您的扫描结果。
如果您绝对必须尽快在云中安全地进行这些扫描，则必须更改Google Drive中的设置以允许移动数据上传。请注意，这可能会占用大量数据上限。完成上传后，您可能希望将设置改回来。
要启用移动文件上传：
- 选择“汉堡”图标( “hamburger” icon)
- 选择设置(Settings)
- 向下滚动到数据使用(Data Usage)
- 将仅通过 WiFi 传输文件(Transfer files only over WiFi)切换为关闭
当您的重要上传完成后，请务必重新打开此设置，否则将在月底面临巨额移动数据账单的风险。
获得最佳结果的提示
虽然 Google Drive 扫描功能背后的技术令人印象深刻，但您可以做一些事情来帮助使结果更好。
- 首先，确保有足够的光线！您的相机需要光线才能工作。即使是昂贵的旗舰智能手机相机在弱光条件下也不会做得很好。
- Google Drive 应用程序确实可以(does)让您在紧要关头打开闪光灯。问题是刺眼的内置闪光灯很可能会在纸张上造成眩光。所以你最好使用柔和的漫射光，比如头顶的荧光灯。只是(Just)不要将手机直接放在灯光下方，否则会在其上投下阴影。
- 尽可能把文件弄直。平面文档可以很好地扫描，但折叠或皱巴巴的文档很难让软件获得良好的扫描效果。只要它不是太闪亮，它甚至可以帮助将其放置在透明文件夹中。
- 接下来，确保文档处于焦点位置。这在大多数手机上都很简单。只需(Just)点击文档，手机的自动对焦就可以完成这项工作。再一次，更好的光线意味着更好的自动对焦性能。
- 虽然不太方便，但如果您有手机三脚架或以某种方式将手机稳定地固定在文档扫描区域上，它也会获得更好的效果。如果您有很多页面要扫描，这将特别有用。
最后，如果您要扫描一本书的页面，有两种方法可以获得良好的扫描效果。一种是交替放置在其封底或封面上的书。这样左页或右页就可以很好地直接扫描。或者，为什么不一次扫描两页书呢？只需确保正确旋转每个图像以使其易于阅读。
精益、平均、扫描机器
这就是您使用手机将文档扫描到Google 云端硬盘所需的全部知识。(Google Drive)至少，直到你的空间用完为止。如果您确实想增加用于Google服务的驱动器空间量，请查看我们关于Google One的文章，找出哪些软件包可能适合您。
How to Scan to Google Drive with Your Phone
Flatbed scanners have been the mainstay of image digitization for decades now. The problem is that you probably don’t have one and you almost certainly don’t have one on you all the time.
Smartphone cameras today are so good that you can not only take a highly-detailed picture of a document, but probably zoom right down to the ink dots. So why are we using scanners at all any more?
Well, your camera app just doesn’t have the same functions as scanner software. Luckily you can scan documents to Google Drive using a neat tool in the app that most people probably don’t know about!
How Is This Different From Photographing Documents?
The big advantage that a document scanner has over a smartphone photograph isn’t detail or quality. It’s the fact that the scanner holds the document in a precise way and offers perfect, consistent lighting with every scan. Also, it captures the image exactly perpendicular to the paper.
When you take a photo with your phone, the page might be distorted, show a bunch of unwanted objects around it and be poorly lit. Manually correcting for all these problems would take a lot of time and effort. Not great if you want results that look close to what a flatbed scanner achieves.
Google has used its software development talents to quickly and almost automatically compensate for the shortcomings of smartphone camera scanning.
What You’ll Need
To scan to Google Drive using the Google Drive app, there’s a very short list of things you’ll need:
- A smartphone or tablet (with a camera) running Android or iOS
- A Google account
- A flat surface with decent lighting
- A page, book or other document you want to scan
- An internet connection
If you’ve got everything on this list, we’re ready to walk you through the process of scanning to Google Drive from your phone.
How to Scan to Google Drive with Your Phone
Assuming you’ve already installed the Google Drive app and have logged in to your Google account, here’s how to scan a document:
- First open the app and then select the plus icon used to create a new document.
- Among the options, you’ll see Scan. Select Scan to proceed.
- Now you’ll see this scanning interface, which shows you a live view of what the camera sees.
- Position your document and then line it up in the viewfinder. You don’t have to fill the window and you don’t have to be super precise. You may have the option to choose between different cameras if your phone has multiple units. The main camera is usually the best choice.
Tap the large white shutter button to scan the page.
- Now you’ll see this preview of the photo. If it looks good to you, choose OK. If not, choose Retry and try again.
- Now you have the opportunity to tweak the scanned page. Select the back button to retake the photo. Select the color palette to change the image from black and white to color.
- The next button to the right will rotate the image and the last button is the crop function. However, this “crop” function actually lets you double-check the selection that Drive has automatically made around the page. Drag the nodes to correctly trace the page if there’s a mistake.
- If you only have one page to scan, you can now choose the Save button, but if you want to add more pages, choose the plus sign and repeat the above steps until you have all the pages of the document scanned.
Now you’ll be asked to save the document as a PDF on your Google Drive account. Give it a name, choose which Google account it should be saved under and then pick a location for it.
Where Are My Documents?
When you first scan a document with the Google Drive app, you’re creating a scan that’s local to your phone’s storage. If you’re on a WiFi connection, that scan will be automatically uploaded to whatever Google Drive folder you specify. Depending on your app settings, uploads may also happen via mobile data, but by default Drive waits for WiFi before uploading any files from your phone to the cloud.
This also means that you won’t be able to share your scans with anyone until you’ve connected to WiFi.
If you absolutely must get those scans safely in the cloud as quickly as possibly, you have to change the setting in Google Drive to allow for mobile data uploads. Be warned that this can eat a large chunk of your data cap. You’ll probably want to change the setting back after completing your upload.
To enable mobile file uploads:
- Select the “hamburger” icon
- Select Settings
- Scroll down to Data Usage
- Toggle Transfer files only over WiFi to off
When your critical uploads have completed, be sure to turn this setting back on or run the risk of huge mobile data bills at the end of the month.
Tips for Getting the Best Results
While the technology behind Google Drive’s scanning function is pretty impressive, there are a few things that you can do to help make the results even better.
- First, make sure there’s enough light! Your camera needs light to work. Even expensive flagship smartphone cameras aren’t going to do a great job in low-light conditions.
- The Google Drive app does let you switch on the flash in a pinch. The problem is that the harsh built-in flash is likely to cause glare on the paper. So you’re better off using a soft diffuse light such as the overhead fluorescents. Just don’t position your phone directly beneath the light, or you’ll cast a shadow on it.
- Straighten the document out as much as possible. A flat document will scan well, but one that’s folded or crumpled makes it hard for the software to get a good scan. It can even help to place it inside a transparent folder, as long as it’s not too shiny.
- Next, make sure the document is in focus. This is pretty simple on most phones. Just tap on the document and the phone’s autofocus should do the job. Once again, better light means better autofocus performance.
- While it’s not as convenient, if you have a phone tripod mount or some way to hold the phone steady over the document scanning area, it’ll also make for better results. This is especially useful if you have lots of pages to scan.
Finally, if you’re trying to scan the pages of a book, there are two ways to get a good scan. One is to alternate the book laying on its back or front cover. So that the left or right page is nice and straight for scanning. Alternatively, why not scan the book two pages at a time? Just make sure you rotate each image correctly to make it easy to read.
A Lean, Mean, Scanning Machine
That’s all you need to know to scan documents to Google Drive with your phone. At least, until you run out of space. If you do want to increase the amount of drive space you have for your Google services, check out our article on Google One and find which of the packages might be the right one for you.
