Prevent Redaction from Reducing File Size

[Shereif26625438eexs]

Hi,

I want to redact and maintain full quality, how do I do this?

I need to perform some OCR after redaction, when the file shrinks the OCR doesn't do so well.

I tried unchecking "Save as optimize for Fast Web View"  No luck there.  File still gets shrunk automatically.  See screenshot below.

Whenever I redact the data, and hit Apply, the file size is automatically reduced.  I just want the data being redacted to be removed, but I want the quality to be the same.

Thank you! 🙂

[JR Boulay]

You cannot remove objects from a document without reducing its size!

[Shereif26625438eexs]

Reducing size because there is less stuff makes sense, but try eliminating something tiny from a large doc and you will see what I mean.  The pdf is reduced in size and the quality of the unredacted items goes down.

I am starting from a scanned PDF, btw.  

Thank you

[Blue Car]

If we turn off Sanitize option after press Apply then Acrobat won't Reduce but file size may increase.

[Eric Dumas]

Did you try to run the OCR first?

The 'Optimise for fast web view' seems to be a way to save a preview so the file saved in a way that the first page will open faster then start opening the next page, then the next... instead of waiting for the whole file to load and open all the pages at once. I never saw a major impact on the quality

[Shereif26625438eexs]

That's interesting.  So, OCR the Doc first, then redact, then apply redactions.  I will give it a try.

Thank you

[JR Boulay]

I am starting from a scanned PDF, btw.

This is what causes recompression and/or downsampling since these are images and there is nothing vector.

As Eric said, you should run the OCR before, using the "Editable text and Images" setting. You can also choose the sub-sampling threshold.

[V5E7A]

If you "Apply redactions", turn-off "Sanitize and remove hidden information". This should prevent "Reducing PDF size". If you want to remove hidden information, do that manually later.