Try converting the 16 bit image to 8bit to dither it.
If this is in Marmoset Toolbag, and you're using 16 bit tiff, you'll get some issues, try PSD instead or again, converting to 8bit. Also make sure you have your tangent space set up correctly in the mesh properties.
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If this is in Marmoset Toolbag, and you're using 16 bit tiff, you'll get some issues, try PSD instead or again, converting to 8bit. Also make sure you have your tangent space set up correctly in the mesh properties.