At least an 8 megapixel camera would be needed. But this has the drawback of probably producing only large full-color 24- or 36-bit JPG image files,
which also include the background paper color unless the contrast can be greatly increased, whereas for most scientific textbook pages only 1-bit
monochrome or 8-bit grayscale images are necessary. Some digital cameras may be capable of being set to take only 8-bit grayscale images, though.
Also, the images may have to be trimmed to the size of the pages. 1-bit monochrome files are most efficiently saved as TIF or PCX files.
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