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. Scan in black and white whenever possible. If a page has many unrecognized words or small text (9 points or smaller), try scanning at a higher resolution.

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 you save the PDF using Save As, the scanned image may be compressed.įor most pages, black-and-white scanning at 300 dpi produces text best suited for conversion. If this image is appended to a PDF document, and you save the file using the Save option, the scanned image remains uncompressed. Lossless compressions can only be applied to monochrome images. 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 or JBIG2 (Lossless) for monochrome images. Also, input resolution higher than 600 dpi is downsampled to 600 dpi or lower. If you select Searchable Image or ClearScan for PDF Output Style, input resolution of 72 dpi or higher is required.

Additional checks in the Preflight toolĪcrobat scanning accepts images between 10 dpi and 3000 dpi.

Analyzing documents with the Preflight tool.

Automating document analysis with droplets or preflight actions.

Correcting problem areas with the Preflight tool.

Viewing preflight results, objects, and resources.

PDF/X-, PDF/A-, and PDF/E-compliant files.

Playing video, audio, and multimedia formats in PDFs.

Add audio, video, and interactive objects to PDFs.

Edit document structure with the Content and Tags panels.

Reading PDFs with reflow and accessibility features.

Capture your signature on mobile and use it everywhere.

Overview of security in Acrobat and PDFs.

Securing PDFs with Adobe Experience Manager.

Convert or export PDFs to other file formats.

Hosting shared reviews on SharePoint or Office 365 sites.

Working with component files in a PDF Portfolio.

Add headers, footers, and Bates numbering to PDFs.

Send PDF forms to recipients using email or an internal server.

Troubleshoot scanner issues when scanning using Acrobat.

Change the default font for adding text.

Enhance document photos captured using a mobile camera.Rotate, move, delete, and renumber PDF pages.Asian, Cyrillic, and right-to-left text in PDFs.Grids, guides, and measurements in PDFs.Access Acrobat from desktop, mobile, web.

How to find dpi of pdf file on pc