This has several steps, in general terms: Calibrate your monitor. Calibrate your printer and generate a color profile to the specific printing conditions including machine, paper, and inks. Use the profile on the computer to simulate the colors on the screen that will be printed.
When you convert to sRGB, Photoshop maps all of the out-of-gamut colors to the closest in-gamut colors. This can result in a loss of color saturation and may increase contrast. You can convert an image to sRGB in Photoshop by going to Edit > Convert to Profile and choosing sRGB from the drop-down menu. You can also choose Convert to Profile
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