Unwanted Lines after Optimize to Deskew

Question

I'm using Adobe Acrobat Pro XI. I have a number of image files that were converted to PDF by a client who inherited them from a gentleman who is no longer with the company. These were large documents that were scanned in slices, then compiled into a single image before being converted to PDF. The PDF's are slightly skewed and no border lines show up between the image slices. If the Adobe Acrobat Edit Text & Images is chosen, each slice of the image can be selected.

The problem I'm having is with the Optimize Scanned PDF command in the Document Processing menu. If I use this feature, the resulting image shows the border between each slice of the image, which is unacceptable. I suspect the image may have been purposely skewed so these faint black hairlines don't show up on the screen. Note that these unwanted lines don't appear when printed to an 8.5X11 sheet of paper on a printer.

Is there any means to deskew an image made of multiple slices and NOT get the unwanted border lines around each slice on the screen view in the process?

Shcomst · Accepted Answer

If you have access to the original CAD files that were used to generate the film versions, you can possibly save or export them as vector PDFs, which would be ideal. Another way to remove the stitching lines is to export to a TIFF or PNG from Acrobat (File> Export to> Image) this will combine the fragments and remove the stitching lines. You can then open the TIFF or PNG in Acrobat and save-as a new PDF (PNG will produce a smaller file). You can also do this in Photoshop, if you have it. I tested this on a file that had stitching and it worked well, as long as Anti-aliasing is turned off. There are several ways to rotate an image in Photoshop, You could try File> Automate> Crop & Straighten Photos.

The client reported that the original CAD versions do not exist. I'm using Acrobat XI Pro, so there is no (File> Export to> Image). There is a (File>Save As Other>Image), which is apparently the same thing. Unfortunately, this method did not combine the 102 fragments in the PDF either.

I'm aware that Photoshop will stitch images together so they become one. The time it takes to do this process is not available on this project. Fortunately the client is willing to keep the minor skew that hides the stitching lines on the monitor in the final print production.

Luke Jennings · Answer

You could try to open the combined PDF in Photoshop, which will combine the sections into a single image, then rotate (Image> Image Rotation> Arbitrary), then save as a Photoshop PDF. If that doesn't work, you can combine the individual slices in Photoshop using File> Automate> Photomerge. This works really well to combine multiple images seamlessly, e.g. when you take multiple horizontal pictures of a landscape and combine them into a single panoramic image.

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