# PDF charts in EPUB: what is lost

Source: https://epubcc.com/cases/charts-and-graphs/ (updated 2026-11-04)

Charts drawn as vector graphics are not kept: the EpubCC engine keeps raster images but not vector drawings, so a line chart loses its lines and its axis labels turn into loose paragraphs. On the 487-page Economic Report of the President 2024 the text around the charts converts well; the charts themselves do not.

Problem: Line and bar charts drawn as vector graphics, with axis labels and legends as real text, plus statistical tables and boxes.

- Limitation: Vector charts are lost. Only raster pieces survive (here, the grey recession bands), and the axis labels, legend and sources become separate short paragraphs.
- Limitation: Statistical tables are written as text in reading order, not rebuilt as tables.
- Limitation: The statistical tables at the end (pages 413 onwards) use a font without a Unicode map: those characters come out as «�» and the engine warns about them (78 per 1,000 characters on the whole document). OpenDataLoader reports 0 here.
- Limitation: 9 pages are full-page images (covers and separators) and are left out, with a warning.
- Limitation: There is no independent reference text for this document, so the table measures unmapped characters, not text quality.