Soft proofing (Lightroom)
Soft proofing simulates in Lightroom how your photo will look printed, based on the colour profile of your printer or paper. You see in advance which colours fall outside the paper's range, so you get no surprises when printing. You turn it on in the Develop module with the key S.
Choose the ICC profile of your paper and printer, and Lightroom shows the expected colours and tone on that material. The out-of-gamut warning shows where saturated colours get flattened, so you can tame them. With a proof copy you edit a separate version specifically for the print. Tip: if your paper dampens the blacks or saturation, give some extra contrast and clarity back in the proof copy.
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The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.