Adobe Printing of Oversized and OCR Image Min of 72 dpi

Question

We have drawings that are 12" x variable length.  Length can be over 1000".  Uses a special fanfold paper.  It took me quite a bit to figure out how to convert this from a DWF to a PDF using Adobe printing.  But when I run the OCR, it cannot.  Error says "Acrobat could not perform Text Recognition on this page because:  The resolution of this page image is below the minimum of 72 dpi."  I've played around with the settings so much I've not got to figure out how to reset back to default but have most definitely had resolution to 1200dpi.  I'm at a loss right now and we have a lot of these files we'd like to convert to PDF.  And that's tricky enough since PDFs didn't originally support file sizes this long.  Any help much appreciated.

AnandSri · Accepted Answer

Hello Jason!

I hope you're doing well, and we apologize for the delayed response and the trouble.

Please ensure you have the latest version of Acrobat installed on the machine: 25.001.2043x Optional update, Mar 19, 2025. Check for any pending updates from the Menu > help > check for updates, install the updates, restart the app and the machine, and check. For more information, see this: https://adobe.ly/4jylP5Y

Adjust Image Resolution Without Resampling:

Open the image in an editor like Adobe Photoshop.
Change the resolution to 300 dpi without resampling (ensure pixel dimensions remain unchanged).
Save and re-import the image into Acrobat for OCR processing.

Convert DWF to PDF:

- Use Acrobat Pro's File > Create > PDF from File option to convert DWF files directly to PDF. This method can handle larger page sizes more effectively.

Crop and OCR in Sections:

In Acrobat, use the Crop tool to divide the page into smaller sections.
Run OCR on each section separately.
Be aware that this method may lead to partial OCR results being overwritten when processing subsequent sections.

Rescan at Higher Resolution:

If possible, rescan the original document at 300 dpi in black and white.
This resolution is optimal for OCR and keeps the page dimensions within acceptable limits.

You may also try the suggestions from this article: https://adobe.ly/3RQ3FAJ

I hope this helps.

Thanks,

Anand Sri.

Dave Creamer of IDEAS · Answer

Are there any pixel graphics in the AutoCAD file, such as a logo?Try using the Acrobat Pro File>Create menu and select the DWF file. (PDFs have supported larger page sizes since version 7.)

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