When the text is selected in the PDF viewer, the selection is not exactly contiguous, either selecting other text as if it were part of the string seen, or adding spaces between each letter, or both. I have seen PDF files where the software that generated it was not at all sophisticated and placed each and every letter as a separate entity. It contains text with font descriptions and location information. So it would seem the text selectable PDF file is not an image at all. The file that presents as text is only 59 kB. The file that presents in the reader as an image is 1.4 MB.
The image is formed by the PDF reader you choose, no? They contain text with formatting which can be selected and copied from the PDF document. I’m trying to understand what you are saying, but the reality is these documents are not printed to PDF as an image in the general case.
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