Questions and postings pertaining to the development of ImageMagick, feature enhancements, and ImageMagick internals. ImageMagick source code and algorithms are discussed here. Usage questions which are too arcane for the normal user list should also be posted here.
A PDF file does not have a density anyway. IM will apply a default interpretation of 72dpi unless you override it (e.g. -density 300x300 -units pixelsperinch).