PDF to TIFF - Output is blurry using Compression 4
The JPEG compression artefacts in your document could be producing noise when using the default fast 1-bit conversion algorithm.
Please set the OneBitConversionAlgorithm to BayerOrderedDithering using the sample below:
renderingOptions.TIFFCompression = TIFFCompression.CCITT4;
renderingOptions.ResolutionOverride = 300;
renderingOptions.OneBitConversionAlgorithm = OneBitConversionAlgorithm.BayerOrderedDithering;