PDF to EPUB Conversion Tools Score Just 30% Average in VIGC Test
Thursday, June 07, 2012
Press release from the issuing company
Publishers wanting to convert their library of books to ebooks may find it problematic, after a test run by the Flemish Innovation Center for Graphic Communication (VIGC) found tools for converting PDFs to EPUB files scored an average of 30% – with the lowest-performing tool scoring just 10%. And even more significant: the four EPUB validation tools the VIGC used produced different results. The VIGC analyses, assesses and will continue its search for appropriate tools.
"There’s no doubt that the popularity of ebooks is soaring," says Eddy Hagen, General Manager at VIGC. "This trend leaves publishers facing a big challenge – they have to convert their whole back catalogue to make them available as ebooks.
“An obvious approach is to take the print-ready PDF files and convert them to EPUB files, the standard file format for ebooks. For printers, this presents a potential new service they can offer their customers. On the internet you can find a lot of tools for converting PDFs to EPUB files – unfortunately, however, it’s not that straightforward."
Conversion tools struggle to make the grade
"We used a very challenging print-ready test file that contained text and images," explains Hagen. "And from a typographic point of view, we added all kinds of tricks. Eventually we ended up with a book covering nearly 30 pages. In total, we tested 65 different elements – from a simple italic, to OpenType functions like ligatures, through mathematical formulas. We didn’t expect any tool to register a perfect score, but at the same time we didn’t expect some tools to score as low as 10%."
Ligatures prove a challenge
“Some conversion tools didn't recognize the ligature and made an incorrect conversion. The automatic use of ligatures is the default in Adobe InDesign – ie InDesign will automatically replace certain combinations with the ligature – so you can imagine how often this happens in a document, and how often this will go wrong with some tools. You need to scan the converted files manually to check for missing letters, which simply isn’t feasible."
Validation misses the mark
The complete report with detailed test results can be purchased from the VIGC. They will also continue their search for good tools for EPUB-creation, to further support publishers and printers.
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