A scanned page image is essentially a photograph or picture of the page. Like a picture it is not seen as text (characters) by the ebook program. What you have to do is run the scanned pages through an OCR program to convert the images to text so that it is treated as text instead of an image. The "gotcha" is that conversion usually results in many errors that require a human to edit the text. I can't tell you how many ebooks I've read that are poorly converted scanned pages. And these are from legitimate publishers.
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