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If you want crisper images and more detail in offset printing on porous papers, go for fewer Lines Per Inch (LPI) screening for your press run. Bring it on down to 133 or 120 instead of 150 or more. Remember, you will lose some detail at this low LPI, so don't use fine line drawings or crisp photos unless you want the effect of softness. This method of offset printing often works well with illustrations in watercolor or pastel.