Thanks dlemstra, and sorry because I had not seen the other post about the same issue https://magick.codeplex.com/discussions/537971
Really we're doing exactly the same converting document to pdf with group4 compression. But we've only put here what we've thought was the problem, the conversion to black & white with thereshold param.
Really we're doing exactly the same converting document to pdf with group4 compression. But we've only put here what we've thought was the problem, the conversion to black & white with thereshold param.