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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;