Scan or photograph at 300 DPI or better, keep the page flat and square to the camera, light it evenly, and avoid heavy compression. Because this format is read and written by the same streaming pipeline as everything else we support, a source saved at low quality has compression artefacts around every letter, and the recogniser reads those as part of the glyph.
The embedded picture is inserted at its original resolution and only scaled for display. Because PDF fixes the page: fonts, vectors, raster images and text coordinates are frozen so every reader sees identical layout, the document may recompress on save depending on the application settings, which is why a very large photo can look slightly softer after a round trip.
之后我能编辑结果吗?
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Yes — the output is a normal PDF that opens in any compatible editor. That is generally the reason for the conversion: turning a flat image of a page into something you can correct, restructure and reuse.
