To convert an RGB file to a target CMYK space, open the image file in Photoshop, then go to Edit > Convert to Profile. Once there, select your target profile (a copy of which should be in the [Your Computer] > Library > ColorSync > Profiles folder, or else it will not appear in the pulldown menu). To choose an export preset, click on the drop-down menu labeled Preset. Save for Web gives you a few extra options for JPEGs, PNGs, and GIFs, different quality levels dictated by color palette, amount of dithering, file size, and so on. Two of these file format options stand out for our purposes: PNG 24 and JPEG High. No, none of this makes any sense. CMYK is a device-dependent color space and arbitrarily converting CMYK colors to RGB serves no purpose, as even if they were created with a specific color profile/ output device in mind, a different device (printer or whatever) would still interpret it differently and mix up the inks. that is the whole point. Check the color profile of an image. 2. Soft proof your images. Once you’ve calibrated your monitor using a colorimeter and installed the Blurb ICC Profile you're ready to prepare your images for BookWright using Photoshop. 1. Convert images to sRGB or CMYK. BookWright accepts CMYK and RGB images, with sRGB being the preferred RGB color space
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convert rgb to cmyk without losing color photoshop