This currently distorts the output size because Tesseract assumes it knows the DPI better than we do. Does not work for Ghostscript, because it emerges that Ghostscript honors /UserUnit for rasterizing but not in pdfwrite (resolve/wontfix). https://bugs.ghostscript.com/show_bug.cgi?id=690781 Ghostscript’s output would need to be patched in a PDF/A safe way for this to work. Temporary route may be to block Ghostscript if /UserUnit.