Enable fast web view in a PDF

Fast Web View restructures a PDF document for page-at-a-time downloading (byte-serving) from web servers. With Fast Web View, the web server sends only the requested page, rather than the entire PDF. This is especially important with large documents that can take a long time to download from a server.

Check with your web master to make sure that the web server software you use supports page-at-a-time downloading.To ensure that the PDF documents on your website appear in older browsers, you may also want to create HTML links (versus ASP scripts or the POST method) to the PDF documents and use relatively short path names (256 characters or fewer).

Verify the Fast Web View Preferences setting

Follow this procedure to make sure that you have Acrobat set up to enable Fast Web View during the PDF creation process.

1. Choose Edit > Preferences (Windows) or Acrobat > Preferences (Mac OS).
2. Under Categories, select Documents.
3. On the right side of the dialog box, under Save Settings, make sure that Save As Optimizes For Fast Web View is selected, or select it now, and click OK.
   

Enable Fast Web View for an existing PDF

Use this procedure after you have verified your Fast Web View Preferences setting and checked the PDF properties to be sure that the file is not already enabled for Fast Web View.

1. Open the PDF that you want to have Fast Web View.
2. Choose File > Save As. Select the same filename and location.
3. When a message appears asking if you want to overwrite the existing file, click OK.

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Correct OCR text in PDFs

When you scan to Formatted Text & Graphics output, Acrobat analyzes bitmaps of text and substitutes words and characters for those bitmap areas. If the ideal substitution is uncertain, Acrobat marks the word as suspect. Suspects appear in the PDF as the original bitmap of the word, but the text is included on an invisible layer behind the bitmap of the word. This makes the word searchable even though it is displayed as a bitmap. You can accept these suspects as they are, or you can use the TouchUp Text tool to correct them.

Note: If you try to select text in a scanned PDF that does not have OCR applied, or try to perform a Read Out Loud operation on an image file, Acrobat asks if you want to run OCR. If you click OK, the Recognize Text dialog box opens and you can select options, which are described in detail under the previous topic.

1. Do one of the following:

   • Choose Document > OCR Text Recognition > Find All OCR Suspects. All suspect words on the page are enclosed in boxes. Click any suspect word to show the suspect text in the Find Element dialog box.

   • Choose Document > OCR Text Recognition > Find First OCR Suspect.

     Note: If you close the Find Element window before correcting all suspect words, you can return to the process by choosing Document > OCR Text Recognition > Find First OCR Suspect, or by clicking any suspect word with the TouchUp Text tool.
2. In the Find option, choose OCR Suspects.
3. Compare the word in the Suspect text box with the actual word in the scanned document, and accept, correct, or ignore the word. If the suspect was incorrectly identified as text, click the Not Text button.
4. Review and correct the remaining suspect words, and then close the Find Element dialog box.

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Recognize text in scanned documents

You can use Acrobat to recognize text in previously scanned documents that have already been converted to PDF.

1. Open the scanned PDF.
2. Choose Document > OCR Text Recognition > Recognize Text Using OCR.
3. In the Recognize Text dialog box, select an option under Pages.
4. (Optional) Click Edit to open the Recognize Text - Settings dialog box, and select the options you want to use.

Scan a paper document to PDF

You can create a PDF file directly from a paper document, starting within Acrobat and using your scanner. In Windows XP, Acrobat supports TWAIN scanner drivers and Windows Image Acquisition (WIA) drivers.

Scanning tips

• Acrobat scanning accepts images between 10 and 3000 ppi. If you select Searchable Image or Full Text & Graphics for PDF Output Style, input resolution of 72 ppi or higher is required, and input resolution higher than 600 ppi is downsampled to 600 ppi or lower.

• On the Color/Grayscale menu in the Optimization Options dialog box, apply lossless compression to a scanned image by choosing CCITT for black-and-white images or Lossless for color or grayscale images. If this image is appended to a PDF document, and the file is saved by Save, the scanned image remains uncompressed. If the PDF document is saved using Save As, the scanned image may be compressed.

• For most pages, black-and-white scanning at 300 ppi produces text best suited for conversion. At 150 ppi, OCR accuracy is slightly lower, and more font-recognition errors occur; at 400 ppi and higher resolution, processing slows and compressed pages are bigger. If a page has many unrecognized words or very small text (9 points or smaller), try scanning at higher resolution. Scan in black and white whenever possible.

• When Recognize Text Using OCR is disabled, full 10-to-3000 ppi resolution range may be used, but the recommended resolution is 72 and higher ppi. For Adaptive compression, 300 ppi is recommended for grayscale or RGB input, or 600 ppi for black-and-white input.

• Pages scanned in 24-bit color, 300 ppi, at 8-1/2–by-11 inches (21.59-by-27.94 cm) result in large images (25 MB) prior to compression. Your system may require 50 MB of virtual memory or more to scan the image. At 600 ppi, both scanning and processing typically are about four times slower than at 300 ppi.

• Avoid dithering or halftone scanner settings. These can improve the appearance of photographs, but they make it difficult to recognize text.

• For text printed on colored paper, try increasing the brightness and contrast by about 10%. If your scanner has color-filtering capability, consider using a filter or lamp that drops out the background color. Or if the text is not crisp drops out, try adjusting scanner contrast and brightness to clarify the scan.

• If your scanner has a manual brightness control, adjust it so that characters are clean and well formed. If characters are touching, use a higher (brighter) setting. If characters are separated, use a lower (darker) setting.

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Create a PDF from a blank page

Since Adobe® Acrobat® 8 Professional has introduced the PDF Editor feature. With it, you can now create a PDF from a blank page rather than beginning with a file, a clipboard image, or scanning.

This process can be useful for creating relatively small PDFs of up to about a dozen pages. For longer, more complex, or heavily formatted new documents, it’s usually better to create the source document in an authoring application that offers more layout and formatting options, such as Adobe InDesign or various business software products.

Note: The PDF Editor can make changes in text only with PDFs created from blank pages. To add a blank page to a PDF created by another method, create a blank document in another application and convert that file to PDF and import it into the existing PDF.

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Convert clipboard images to PDF

You can create PDFs from screen captures and other images you copy from an image editing application.

Use the method described for the operating system running on your computer:

• (Windows) Capture a displayed image to the Clipboard, either by using the Copy command in an image-editing application, such as Adobe Photoshop, or by pressing the PrintScreen key. Then in Acrobat, choose File > Create PDF > From Clipboard Image, or choose From Clipboard Image in the Create PDF toolbar menu.

• (Mac OS) Choose Acrobat > Services > Grab > [Screen, Selection, or Timed Screen]. (Grab is the Mac OS X screen-capture utility.) Your screen capture automatically converts to a PDF and opens.

Note: The From Clipboard Image command appears only when there is an image copied to the clipboard. If the clipboard is empty or if you have copied text to the clipboard, the command does not appear.

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It's simple. Just drag and drop method to create PDFs

This method is usually best reserved for small, simple files, such as small image files or plain text files, when the balance between file size and output quality is not important. You can use this technique with many other types of files, but you won’t have the opportunity to adjust any conversion settings during the process.

1. Using Explorer (Windows) or the Finder (Mac OS), select the file icons of one or more files that you want to convert to PDF.
2. Drag the file icons onto the Acrobat application icon. Or, (Windows only) drag the files into the open Acrobat window.

   If a message appears saying that the file could not be opened in Acrobat, then that file type cannot be converted to PDF by the drag-and-drop method. Use one of the other conversion methods for that file.

   Note: You can also convert PostScript and EPS files to PDF by dragging them onto the Acrobat Distiller window or the Distiller application icon.
3. If you selected more than one file, click Yes or No when a message appears asking if you want to combine the files into one PDF.
4. Save the PDF.

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Balancing PDF file size and quality

There are important settings that you can select so that your PDF has the best balance between file size, resolution, conformity to specific standards and other factors. Which settings you select depends on your goals for the PDF that you are creating. For example, a PDF intended for high-quality commercial printing requires different settings than a PDF intended only for on-screen viewing and quick downloading over the Internet.

Once selected, these settings apply across PDFMaker, Acrobat, and Acrobat Distiller. However, there are some settings that are limited to specific contexts or file types. For example, PDFMaker options can vary among the different types of Microsoft Office applications.

For convenience, you can select one of the conversion presets available in Acrobat. You can also create, define, save, and reuse custom presets that are uniquely suited to your purposes.

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What’s the best way to create a PDF

There are many correct answers to this question. You create a PDF by converting on other documents and resources to Portable Document Format.

Adobe Acrobat is a powerful tool with many uses, but it is not an authoring application—that is, not an application in which you design page layouts, write text, or create and place images on a blank page. Instead, it works in harmony with other applications and built-in operating system features to produce PDFs that you can then use for a variety of purposes.

The best method for creating a PDF depends on several things:

• What is the source document?

  You can create PDFs from documents printed on paper, Word documents, InDesign files, images taken by a digital camera, and spreadsheets, to name just a few examples. Different types of sources have different tools available for PDF conversion.

• What is already running on your computer?

  You can save time by using the most readily available Acrobat conversion feature. If the document you want to convert is already open in its authoring application (for example, an spreadsheet that is open in Excel), there are several ways to convert the file to PDF without opening Acrobat. Similarly, if Acrobat is already open, you don’t have to open the authoring application to convert a file to PDF.

• How will you use the PDF?

  Every PDF strikes a balance between efficiency (small file size) and quality (such as resolution and color). When that balance is critical to your task, you’ll want to use a method that includes access to various conversion options as a part of the process.

  For example, you can drag and drop files on the Acrobat icon on the desktop to create PDFs, but Acrobat simply applies the most recently used conversion settings without offering you access to those settings. If you want more control over the process, another method might be a better choice.

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Asian-language PDFs

You can use Acrobat to view, search, and print PDF documents that contain Asian (Traditional and Simplified Chinese, Japanese, and Korean), Central and Eastern European, and Cyrillic text. You can also use these languages when you fill in forms, add comments, and apply digital signatures.

Almost all of the Acrobat features are supported for Traditional and Simplified Chinese, Japanese, and Korean text.

In Mac OS, application and system support for Asian text is automatic.

In Windows, you must install the Asian language support files by using the custom installation and selecting the Asian Language Support options under Create Adobe PDF and View Adobe PDF.

PDFMaker and the Adobe PDF printer automatically embed most Asian fonts in your file when creating PDF files. You can control whether Asian Fonts are embedded.

In Windows, you may be able to view and print files that contain Asian languages without having the necessary Asian language support installed on your system. If you try to open a PDF file for which language support is required, you are automatically prompted to install the required fonts.