Hi,
I have tried out Aspose.Pdf .Net version 9.8.0.0 today because it contains this enhancement:
PDFNEWNET-32106Improve the performance while converting PDF file to Image
I am sorry to say that for some PDF's the image conversion is still very slow and I do not see significant performance improvement.
The particular situation I am facing is that a customer uses scans processed by Kofax, where each PDF page contains a full page image with OCR text behind the image. Now I understand that Aspose still needs time to render the text although it is behind the image, but in our tests Aspose.PDF image rendering is 25 times slower compared to direct extraction of the image (using iTextSharp). That difference is way too large.
The attached zip contains an example program demonstrating the difference, a sample customer scan is included. Results for converting first 4 pages to 300 dpi jpeg (same as native resolution of the scan) are:
Aspose.PDF 8.7.0.0: 33.09 sec
Aspose.PDF 9.8.0.0: 32.03 sec (3.3% faster)
iTextSharp image extract: 1.25 sec (2647% faster)
When I saw that PDFNEWNET-32106 was released in v9.8.0.0 I was hoping for a more substantial improvement in performance.
Best regards,
Berend Engelbrecht