How can you preview an RGB document to see its appearance in CMYK without modifying the image data?

Previewing an RGB document to see how it would appear in CMYK without actually altering the image data can be achieved through the soft proofing feature in Photoshop. This tool allows you to simulate how colors will look when printed using a CMYK color profile, providing a visual approximation of the final output without changing the original RGB file.

Using the option to set up a proof with a specific CMYK working space ensures that you are viewing the colors as they would be translated into the CMYK color gamut, allowing you to make informed decisions about color adjustments if necessary. This is particularly useful for designers who need to ensure their work translates well from screen to print, as the color reproduction can significantly differ between RGB digital displays and CMYK print outputs.

In contrast, checking color settings or changing the image mode wouldn't directly provide the visualization needed for soft proofing, and those options would potentially alter the document's format or its working profile in a way that doesn't allow for a straightforward preview of the CMYK representation. Additionally, using proof setup provides the flexibility to create customized proofs based on specific printer profiles, enhancing accuracy and effectiveness in previewing the final printed outcome.