I have a PDF files with 180+ pages. I want to generate thumbnails 200×250 in JPG format.
PDFView4Net: It takes a total of ~52 seconds.
Looking for an alternative solution, I come across a solution involving ImageMagick+GhostSciprt. Using the command “convert”, it takes only ~15 seconds to generate all the thumbnail images. However, the image quality seems to suffer a little. The default dpi is 72 for ImageMagick vs 96 for PDFView4Net.
The windows version of ImageMagick has a bug. If you have a multiple pages PDF, it may convert only the first page.
The solution is “Edit delegates.xml and change pngalpha to pnmraw.” It works for me.