Adobe 22101156 - Acrobat Capture - PC Manuel utilisateur

Online Guide

• Commands

• Using the Capture plug-in

• Capturing documents

• Correcting captured documents

• Setting Capture plug-in

preferences

• Troubleshooting

Adobe

Acrobat

Capture Plug-In

Commands

Capturing docu-

Setting Capture

Correcting captured docu-

To review and correct sus-

File

Capture...Preferences

Document

Capture Pages...

Edit

Show Capture Suspects

Find First Suspect

Using the Capture plug-in

You use the Capture plug-in when you choose the

Capture Pages command in Acrobat Exchange. The

plug-in uses optical character recognition (OCR) to

convert bitmap text to text that can be corrected,

indexed, searched, or copied to other ﬁles. The text

it converts is in PDF image documents that were

scanned directly, or imported, into Acrobat. For

information about these PDF documents, and about

the kinds of PDF documents produced by capturing

text from them, see

About PDF document styles

You can conﬁgure the Capture plug-in to recognize

any of eight languages, hide recognized text behind

a document image, and downsample images to

minimize ﬁle size. For more information, see

Setting Capture plug-in preferences

After you capture a document, you can use the

touch-up tool in Exchange to review and correct

text. See

Correcting captured documents

for

details.

The Capture plug-in is installed from the Acrobat

3.0 CD-ROM. For details on running the Acrobat

Installer, see the

Acrobat Getting Started Guide

Use the Capture plug-in to convert small collections

of paper documents and electronic images to PDF

directly from Acrobat Exchange. If you need to con-

vert large collections of paper documents or elec-

tronic images to PDF, consider upgrading to the full

Acrobat Capture product, which offers a number of

automated processing features and enhanced

reviewing capabilities.

About PDF document styles

Adobe Acrobat can produce three styles of PDF

documents:

•

PDF Image Only

documents contain only a bitmap

picture of the original document. PDF Image Only ﬁles

are produced by the Scan and the Import commands in

Exchange. If you need to convert and view image ﬁles

quickly, PDF Image Only is sufﬁcient.

•

PDF Normal

documents contain electronic text that

is scalable and can be indexed, searched, and copied.

Page formatting and graphical images are preserved.

You can create this kind of ﬁle with Acrobat Distiller, PDF

Writer, or the Capture Pages command in Exchange. PDF

Normal ﬁles are signiﬁcantly smaller than their PDF

Image Only counterparts, making them ideal for online

distribution.

•

PDF Original Image with Hidden Text

documents

combine features of PDF Image Only and PDF Normal

documents. They contain a complete bitmap picture of

the original document, but with recognized text hidden

behind the picture. This provides the advantages of

searchable text while ensuring that a document is iden-

tical in appearance to the original. Use this kind of PDF

ﬁle when you are required to keep the original scanned

image of a document for legal or archival purposes. PDF

Original Image with Hidden Text ﬁles can be created

only with the Capture Pages command in Exchange.

When you capture a PDF Image Only ﬁle, it usually

reduces ﬁle size signiﬁcantly. In most cases, PDF

ﬁles captured with the PDF Normal setting are

smaller than those captured with the PDF Original

Image with Hidden Text setting. For details, see

Comparing PDF ﬁle sizes

Capturing documents

The documents you capture are image ﬁles that

you have scanned or imported into Exchange—

PDF Image Only

ﬁles.

To capture a document:

Using Exchange, do one of the following:

•

To import an image ﬁle, choose File > Import > Image.

Select the ﬁle you want to import and click Open. See

Acrobat Exchange

for more information on importing

image ﬁles.

•

To scan a paper document, choose File > Scan.

Choose a scanner device and document type; then click

Scan. See

Acrobat Scan

for information on using a

scanner with Acrobat Exchange.

Choose Document > Capture Pages.

Determine which pages you want to capture by

selecting All Pages, Current Page, or Speciﬁed Range

and entering the page numbers in the text box.

If you want to change the Capture preferences,

click Preferences. The document will be captured

with the new settings. See

Setting Capture plug-in

preferences

for details.

Click OK. The Capture progress window shows the

page, character, and word recognition process. In order

for the process to be successful, the resolution of the

captured PDF Image Only ﬁle must fall within the follow-

ing ranges:

•

Monochrome images, 200–600 dpi

•

Grayscale or color images, 200–400 dpi

Also, the text should be dark against a light back-

ground. Text on a dark or shaded background, or on

a page with complex color gradients, may not be

recognized.

Correcting captured documents

When the Capture plug-in suspects it has not recog-

nized a word correctly, it displays the bitmap image

of the original word in the document and hides its

best guess for the word behind the bitmap. This

ensures accurate reproduction of the original, even

without correction.

You can review and correct

suspect

words in

Exchange with the touch-up tool. This is useful

when you want your document to be fully search-

able, for example, when indexing it for publication

on CD-ROM or the World Wide Web.

Note:

The Capture plug-in uses the current PDF

Writer settings for font embedding and subsetting

when it creates PDF ﬁles. To avoid problems when

correcting a captured document, be sure that font

subsetting is not selected in PDF Writer before

capturing the document. See

PDF Writer

for more

information.

To view all the suspect words in a document:

Choose Edit > Show Capture Suspects. Each of the

suspect words in the document is highlighted.

To review and correct suspect words:

Choose Edit > Find First Suspect. The suspect text is

highlighted, and its bitmap image appears in the

Suspect Image window.

Choose from one of the following:

•

To accept the highlighted suspect text as correct,

click Accept (TAB). The bitmap image is discarded.

•

To leave the bitmap image in place, click Next

(Shift+TAB).

•

To edit the highlighted suspect text, type the correct

text; then click Accept (TAB). The text is changed, and

the bitmap image is discarded.

See

Acrobat Exchange

for more information on

using the touch-up tool.

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