The huge amount of memory usage is not due to the memory leak. It only leaks small memory blocks. The previous Q16 version of Magick.NET used 32 bits per pixel. The new version uses 'only' 16 bits per pixel. For PDF files with a lot of pages Magick.NET will still have to create an in memory block for each page. If your PDF contains 194 pages and is 1240x1754 the total memory used is: 194 * 1240 * 1754 * 4 (nr channels) * 32 = 54008606720 bits = 6.2GB.
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