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Note: The scanner uses either the selected Color/Grayscale option or the selected Monochrome option. Which one is used
depends on the settings you select in the Acrobat Scan dialog box or in the scanner’s TWAIN interface, which may open
after you click Scan in the Acrobat Scan dialog box. (By default, the scanner application dialog box does not open.)
Monochrome
When scanning black-and-white or monotone images, select one of the following:
•
JBIG2 (Lossless) & JBIG2(Lossy)
Applies the JBIG2 compression method to black-and-white input pages. Highest
quality levels use the lossless method; at lower settings, text is highly compressed. Text pages typically are 60% smaller
than CCITT Group 4 compressed pages, but processing is slow. Compatible with Acrobat 5.0 (PDF 1.4) and later.
Note: For compatibility with Acrobat 4.0, use a compression method other than JBIG2.
•
CCITT Group 4
Applies CCITT Group 4 compression to black-and-white input page images. This fast, lossless
compression method is compatible with Acrobat 3.0 (PDF 1.2) and later.
Small Size/High Quality
Sets the balance point between file size and quality.
Deskew
Rotates any page that is not square with the sides of the scanner bed, to make the PDF page align vertically.
Choose On or Off.
Background Removal
Whitens nearly white areas of grayscale and color input (not black-and-white input).
For best results, calibrate your scanner’s contrast and brightness settings so that a scan of a normal black-and-white
page has dark gray or black text and a white background. Then, Off or Low should produce good results. If scanning
off-white paper or newsprint, use Medium or High to clean up the page.
Descreen
Removes halftone dot structure, which can reduce JPEG compression, cause moire patterns, and make text
difficult to recognize. Suitable for 200–400-dpi grayscale or RGB input or, for Adaptive compression, 400–600-dpi
black-and-white input. The On setting (recommended) applies the filter for 300 dpi or higher grayscale and RGB
input. Select Off when scanning a page with no pictures or filled areas, or when scanning at a resolution higher than
the effective range.
Text Sharpening
Sharpens the text of the scanned PDF file. The default value of low is suitable for most documents.
Increase it if the quality of the printed document is low and the text is unclear.
Scanning tips
• Acrobat scanning accepts images between 10 dpi and 3000 dpi. If you select Searchable Image or ClearScan for PDF
Output Style, input resolution of 72 dpi or higher is required, and input resolution higher than 600 dpi is
downsampled to 600 dpi or lower.
• To apply lossless compression to a scanned image, select one of these options under the Optimization Options in
the Optimize Scanned PDF dialog box: CCITT Group 4 for monochrome 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 dpi produces text best suited for conversion. At 150 dpi, OCR
accuracy is slightly lower, and more font-recognition errors occur; at 400 dpi 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 dpi resolution range may be used, but the
recommended resolution is 72 and higher dpi. For Adaptive compression, 300 dpi is recommended for grayscale
or RGB input, or 600 dpi for black-and-white input.
• Pages scanned in 24-bit color, 300 dpi, at 8-1/2–by-11 in. (21.59-by-27.94 cm) result in large images (25 MB) before
compression. Your system may require 50 MB of virtual memory or more to scan the image. At 600 dpi, both
scanning and processing typically are about four times slower than at 300 dpi.
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• Avoid dithering or halftone scanner settings. These settings 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 isn’t
crisp or 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.
Recognize text in scanned documents
You can use Acrobat to recognize text in previously scanned documents that have already been converted to PDF.
Optical character recognition (OCR) software enables you to search, correct, and copy the text in a scanned PDF. To
apply OCR to a PDF, the original scanner resolution must have been set at 72 dpi or higher.
For more information on text recognition, see these videos:
• Recognizing Text in Scanned PDF Documents: www.adobe.com/go/lrvid_025_acrx_en
• How to Edit a Scanned PDF: www.adobe.com/go/learn_acr_edit_scans_en
Note: Scanning at 300 dpi produces the best text for conversion. At 150 dpi, OCR accuracy is slightly lower.
More Help topics
“Adding unifying page elements” on page 110
Converting Scanned PDF Files to Other File Formats
Recognize text in a single document
1 Open the scanned PDF.
2 Choose Tools > Recognize Text > In This File.
3 In the Recognize Text dialog box, select an option under Pages.
4 Optionally, click Edit to open the Recognize Text - General Settings dialog box, and specify the options as needed.
Recognize text in multiple documents
1 In Acrobat, choose Tools > Recognize Text > In Multiple Files.
2 In the Recognize Text dialog box, click Add Files, and choose Add Files, Add Folders, or Add Open Files. Then
select the files or folder.
3 In the Output Options dialog box, specify a target folder for output files, and filename preferences.
4 In the Recognize Text - General Settings dialog box, specify the options, and then click OK.
Recognize Text - General Settings dialog box
Primary OCR Language
Specifies the language for the OCR engine to use to identify the characters.
PDF Output Style Determines the type of PDF to produce. All options require an input resolution of 72 dpi or higher
(recommended). All formats apply OCR and font and page recognition to the text images and convert them to normal text.
•
Searchable Image
Ensures that text is searchable and selectable. This option keeps the original image, deskews it as
needed, and places an invisible text layer over it. The selection for Downsample Images in this same dialog box
determines whether the image is downsampled and to what extent.
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•
Searchable Image (Exact)
Ensures that text is searchable and selectable. This option keeps the original image and
places an invisible text layer over it. Recommended for cases requiring maximum fidelity to the original image.
•
ClearScan
Synthesizes a new Type 3 font that closely approximates the original, and preserves the page background
using a low-resolution copy.
Downsample To
Decreases the number of pixels in color, grayscale, and monochrome images after OCR is complete.
Choose the degree of downsampling to apply. Higher-numbered options do less downsampling, producing higher-
resolution PDFs.
Using the Adobe PDF printer
Create PDFs by printing to file
In many authoring applications, you can use the Print command with the Adobe PDF printer to convert your file to
PDF. Your source document is converted to PostScript and fed directly to Distiller for conversion to PDF, without
manually starting Distiller. The current Distiller preference settings and Adobe PDF settings are used to convert the
file. If you’re working with nonstandard page sizes, create a custom page size.
Note: (Windows) For Microsoft Office documents, the Adobe PDF printer does not include some of the features that are
available from PDFMaker. For example, you cannot create bookmarks and hyperlinks using the Adobe PDF printer. If
you’re creating a PDF from a Microsoft Office document and you want to use these features, use PDFMaker.
Note: The Adobe PDF printer creates untagged PDFs. A tagged structure is required for reflowing content to a handheld
device and is preferable for producing reliable results with a screen reader.
More Help topics
“Creating accessible PDFs” on page 281
“Creating PDFs with PDFMaker (Windows)” on page 54
Create a PDF using the Print command (Windows)
1 Open the file in its authoring application, and choose File > Print.
2 Choose Adobe PDF from the printers menu.
3 Click the Properties (or Preferences) button to customize the Adobe PDF printer setting. (In some applications,
you may need to click Setup in the Print dialog box to open the list of printers, and then click Properties or
Preferences.)
4 In the Print dialog box, click OK.
Note: Your PDF is saved in the folder specified by the setting of the Adobe PDF Output Folder in the Preferences dialog
box; the default location is My Documents. If you specify Prompt For Adobe PDF Filename, then a Save As dialog opens
when you print.
Create a PDF using the Print command (Mac OS X)
The method for creating PDFs using the Print command changed in Mac OS v10.6 Snow Leopard with Acrobat 9.1
and later. The following procedure describes the method in both Snow Leopard and earlier versions of Mac OS X.
1 Open the file in its authoring application, and choose File > Print.
2 Choose Save As Adobe PDF from the PDF menu at the bottom of the dialog box.
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3 For Adobe PDF Settings, choose one of the default settings, or customize the settings using Distiller. Any custom
settings that you have defined are listed.
For most users, the default Adobe PDF conversion settings are adequate.
4 For After PDF Creation, specify whether to open the PDF.
5 Click Continue.
6 Select a name and location for your PDF, and click Save.
Note: By default, your PDF is saved with the same filename and a .pdf extension.
Adobe PDF printing preferences (Windows)
Printing preferences apply to all applications that use the Adobe PDF printer, unless you change the settings in an
authoring application by using the Page Setup, Document Setup, or Print menu.
Note: The dialog box for setting printing preferences is named Adobe PDF Printing Preferences, Adobe PDF Printing
Defaults, or Adobe PDF Document Properties, depending on how you access it.
To access printing preferences:
• Open the Printers window from the Start menu. Right-click the Adobe PDF printer, and choose Printing
Preferences.
• In an authoring application such as Adobe InDesign, choose File > Print. Select Adobe PDF as the printer, and click
the Properties (or Preferences) button. (In some applications, you may need to click Setup in the Print dialog box
to access the list of printers, and then click Properties or Preferences to customize the Adobe PDF settings.)
PDF-specific options appear on the Adobe PDF Settings tab. The Paper Quality tab and Layout tab contain other
familiar options for the paper source, printer ink, page orientation, and number of pages per sheet.
Note: Printing Preferences are different from printer Properties. The Preferences include Adobe PDF-specific options for
the conversion process; the Properties dialog box contains tabs of options that are available for any type of printer.
Adobe PDF Conversion Settings
Select a predefined set of options from the Default Settings menu or click Edit to view
or change the settings in the Adobe PDF Settings dialog box.
Adobe PDF Security
To add security to the PDF, choose one of the following options, or click Edit to view or change
the security settings:
•
Reconfirm Security For Each Job
Opens the Adobe PDF - Security dialog box each time you create a PDF using the
Adobe PDF printer. Specify settings in the dialog box.
•
Use The Last Known Security Settings
Uses the same security settings that were used the last time a PDF was
created using the Adobe PDF printer on your computer.
Adobe PDF Output Folder
Choose an output folder for the converted PDF, or click Browse to add or change the output
folder. Choose Prompt For Adobe PDF Filename to specify a location and filename at the time of conversion.
Adobe PDF Page Size menu
Select a custom page size that you have defined.
View Adobe PDF Results
Automatically starts Acrobat and displays the converted document immediately.
Add Document Information
Includes information such as the filename and date and time of creation.
Rely On System Fonts Only; Do Not Use Document Fonts
Deselect this option to download fonts when creating the
PDF. All your fonts will be available in the PDF, but it will take longer to create it. Leave this option selected if you are
working with Asian-language documents.
Delete Log Files For Successful Jobs
Automatically deletes the log files unless the job fails.
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Ask To Replace Existing PDF File Warns you when you are about to overwrite an existing PDF with a file of the same name.
More Help topics
“Create and use a custom page size” on page 54
Set Adobe PDF printer properties (Windows)
In Windows, you can usually leave the Adobe PDF printer properties unchanged, unless you have configured printer
sharing or set security.
Note: Printing Properties are different from printer Preferences. The Properties dialog box contains tabs of options that
apply to any type of printer; the Preferences include conversion options specifically for the Adobe PDF printer.
Set Adobe PDF printer properties
1 Open the Printers window from the Start menu, and right-click the Adobe PDF printer.
2 Choose Properties.
3 Click the tabs, and select options as needed.
Reassign the port that the Adobe PDF printer uses
1 Quit Distiller if it is running, and allow all queued jobs to the Adobe PDF printer to complete.
2 Open the Printers window from the Start menu.
3 Right-click the Adobe PDF printer, and choose Properties.
4 Click the Ports tab, and then click Add Port.
5 Select Adobe PDF Port (Windows XP) or Adobe PDF Port Monitor (Vista/Windows 7) from the list of available
port types, and click New Port.
6 Select a local folder for PDF output files, and click OK. Then click Close to quit the Printer Ports dialog box.
7 In the Adobe PDF Properties dialog box, click Apply, and then click OK.
For best results, select a folder on the same system where Distiller is installed. Although remote or network folders are
supported, they have limited user access and security issues.
Delete a folder and reassign the Adobe PDF printer to the default port
1 Quit Distiller if it is running, and allow a few minutes for all queued jobs to Adobe PDF to complete.
2 Open the Printers window from the Start menu.
3 Right-click the Adobe PDF printer, and choose Properties.
4 Click the Ports tab.
5 Select the default port, Documents, and click Apply.
6 Select the port to delete, click Delete Port, and then click Yes to confirm the deletion.
7 Select the Documents port again and click Close.
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Create and use a custom page size
It’s important to distinguish between page size (as defined in the source application’s Document Setup dialog box for
your document) and paper size (the sheet of paper, piece of film, or area of the printing plate you’ll print on). Your
page size might be U.S. Letter (8-1/2-by-11 in. or 21.59-by-27.94 cm), but you might need to print on a larger piece of
paper or film to accommodate any printer’s marks or the bleed area. To ensure that your document prints as expected,
set up your page size in both the source application and the printer.
The list of paper sizes available to Acrobat comes from the PPD file (PostScript printers) or from the printer driver
(non-PostScript printers). If the printer and PPD file you’ve chosen for PostScript printing support custom paper sizes,
you see a Custom option in the Paper Size menu. For printers capable of producing very large print areas, Acrobat
supports pages as large as 15,000,000 in. (38,100,000 cm) by 15,000,000 in. (38,100,000 cm).
Create a custom page size (Windows)
1 Do one of the following:
• Open the Printers or Printer And Faxes window from the Start menu. Right-click the Adobe PDF printer, and
choose Printing Preferences.
• In an authoring application such as Adobe InDesign, choose File > Print. Select Adobe PDF as the printer, and click
the Properties button. (In some applications, you may need to click Setup in the Print dialog box to open the list of
printers, and then click Properties or Preferences to customize the Adobe PDF settings.)
2 In the Adobe PDF Settings tab, click the Add button next to the Adobe PDF Page Size menu.
3 Specify the name, width, height, and unit of measurement. Click Add/Modify to add the custom page size name to
the Adobe PDF Page Size menu.
Create a custom page size (Mac OS)
1 In an authoring application such as Adobe InDesign, choose File > Page Setup.
2 In the Paper Size pop-up menu, select Manage Custom Sizes.
3 Click the + button.
4 Specify the name, height, width, and margins. The unit of measurement depends on the system language.
Use the custom page size
1 Choose File > Print.
2 Click the Page Setup button.
3 Select the new custom page size from the Paper Size menu.
Creating PDFs with PDFMaker (Windows)
About Acrobat PDFMaker
PDFMaker is an Acrobat feature that operates within many business applications, such as Microsoft Office
applications, AutoCAD, and Lotus Notes. When you install Acrobat, PDFMaker controls appear in the work area of
the authoring application.
Note: Some PDFMaker features are not available in certain versions of the authoring applications. For a comparison
chart, see Compatible web browsers and PDFMaker applications | Acrobat, Reader.
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