I have observed that while redacting a PDF using Image Area Redaction feature I have to rasterize the whole document first, could you confirm if my understanding is sound or not. Is it possible to apply text redaction on only one page of the pdf document?
You can apply ImageAreaRedaction to any image inside a textual PDF file, such as figure, chart, etc. If you want to hide a block of text on a page, you can use the RegexRedaction based on textual search. If you want to redact the page as an image, yes, you will have to rasterize it first.
As for applying changes only on a specific page, we are working on this feature and it will appear in one of upcoming releases. For now, you can use the redaction callback feature to accept only specific changes and reject others. For instance, if you rasterize a PDF file, the target image index will match the page index.
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