Function export_series_pngs 

pub fn export_series_pngs(
    series: &Series,
    out_dir: &Path,
    store: &AnnotationStore,
    burn_annotations: bool,
) -> Result<usize>

Export every instance in series as a PNG under out_dir. Filenames are slice_0001.png, slice_0002.png, … in slice order. Per-slice decode failures are logged and skipped; the function only fails if the output directory can’t be created.

Returns the number of slices successfully written.