1. When PDF Alchemist finds an image repeated as part of a header or footer it  discards the image within that header or footer.
  2. If PDF Alchemist detects images as page backgrounds in the PDF input document, it will discard them. Sometimes the product will discard valid images that it accidentally detects as backgrounds. You may decide to disable the detection and removal of background images to prevent this, but the HTML output file will be larger as a result.
  3. The product converts line art on PDF pages into raster images in the HTML output or removes this line art from the output entirely. This depends on whether the software detects the line art as necessary page content or as page artifacts. This preserves visual fidelity at some cost to file size.