I am developing a program that convert PDF files to TIFF files. I use imagemagick++ and can accomplish the concersion successfully. But the resolution of the multi-page TIFF files is too low. My code follows:
I do this almost daily. I use a PDF converter driver found on the internet . Install it and it becomes a selectable converter option.Then you can convert PDFs to many forms in any program at all, including Adobe Acrobat . Just open a PDF, select convert, then you can convert pdf to tiff , and choice a form you want, the task will be finished in several seconds. if you haven't found a good choice , you can have a try. best wishes. http://www.rasteredge.com/how-to/csharp-imaging/tiff-convert-pdf/
I don't know anything about imagemagick++ either, but the one thing differing between your list version and your single-image version is setting the resolution units. You set the value in the list version, but in the single-image version you use the default value, whatever it is. Try removing that line from the list version.