If this image is appended to a PDF document, and you save the file using the Save option, the scanned image remains uncompressed. For most pages, black-and-white scanning at dpi produces text best suited for conversion. At dpi, OCR accuracy is slightly lower, and more font-recognition errors occur; at dpi and higher resolution, processing slows, and compressed pages are bigger. If a page has many unrecognized words or small text 9 points or smaller , try scanning at a higher resolution.
Scan in black and white whenever possible. When Recognize Text Using OCR is disabled, full to dpi resolution range may be used, but the recommended resolution is 72 and higher dpi. For Adaptive Compression , dpi is recommended for grayscale or RGB input, or dpi for black-and-white input.
Your system may require 50 MB of virtual memory or more to scan the image. At dpi, both scanning and processing typically are about four times slower than at dpi. Avoid dithering or halftone scanner settings. These settings can improve the appearance of photographs, but they make it difficult to recognize text. If your scanner has the color-filtering capability, consider using a filter or lamp that drops out the background color.
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. You can use Acrobat to recognize text in previously scanned documents that have already been converted to PDF. Scanning at dpi produces the best text for conversion. At dpi, OCR accuracy is slightly lower. Optionally, click Settings to open the Recognize Text dialog box, and specify the options as needed.
Click Recognize Text. Acrobat creates a layer of text in your PDF that can be searched — or copied and pasted into a new document. Then select the files or folder. 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.
Searchable Image Exact. This option keeps the original image and places an invisible text layer over it. Recommended for cases requiring maximum fidelity to the original image. Synthesizes a new custom 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.
When you run OCR on a scanned 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 method makes the word searchable even though it is displayed as a bitmap. If you click OK, the Text Recognition dialog box opens and you can select options, which are described in detail under the previous topic. Acrobat identifies suspected text errors and displays the image and text side by side in the Secondary toolbar. All suspect words on the page are enclosed in boxes. Click the highlighted object or box in the document, and then correct it in the Recognized As box in the Secondary toolbar.
If the file is already open, then choose Combine Files from the right menu. Click Combine to merge all of the files into one PDF. In this article Select the Insert tab. Select Object, and then select Text from File from the drop-down menu. Select the files to be merged into the current document. Press and hold Ctrl to select more than one document. Documents will be merged in the order in which they appear in the file list.
Steps: Select your files in Windows Explorer. Right-click the selected files to show the context menu. Search for Windows Scan and click the top result to open the app. Rearrange the images in the correct order. Alternatively, you can right-click a page and select Insert Pages to get the insert options. In the Insert Pages dialog box, specify where to insert the document before or after the first or last page, or a designated page. Click OK.
You can also add an existing file to an opened PDF. Drag the file icon directly into the Page Thumbnails panel in the navigation pane. You can insert one or more pages of selected content copied from any application into an existing PDF.
Open the document containing the content that you want to add. Alternatively, you can also right-click a page and select Insert Pages to get the insert options. In the Insert Pages dialog box, specify where to insert the selection before or after the first or last page, or a designated page. In the dialog box that appears, enter the URL of the page that you want to add. These files are called OLE container documents. Later, if you edit the original PDF, the OLE features in the container application updates the embedded file in the container document, to reflect your changes.
Legal Notices Online Privacy Policy. User Guide Cancel. Watch a quick video tutorial and get started. Combine or merge multiple files into one PDF now. Click Get Started to launch Acrobat:. Get Started. Here, you will be guided on the easiest way to convert scanned documents to PDF. After uploading your scanned document, choose "PDF" under the "Format" drop-down menu, then go to "OCR Setting" to choose the language you need to recognize.
Then you will get the converted PDF file. Buy PDFelement right now! Margarete Cotty. Try It Free. Margarete Cotty chief Editor.
0コメント