I was emailed a scanned document and am having trouble trying to edit it in Preview. Do I need to download software to edit it, even if its not from a scanner attached to my computer? If I have to, are there any free applications or is Vuescan the only option? I doubt I would use it very often to justify buying it.
To truly edit text in a scanned document requires using OCR software. VueScan is probably the least expensive alternative. To OCR a PDF image file you can try PDF Pen Pro - both at VersionTracker or MacUpdate.