To take color matching in your hands, design within the CMYK color space and then convert to RGB yourself, without losing any colors. Or, if your software doesn’t support the CMYK color space, use an online RGB to CMYK converter to check which colors of your design are out of CMYK color space and adjust those.
RGB is additive. The more color (made of light) you add, the closer you get to white. CMYK is subtractive. The more color (made of ink, which is reflective, which subtracts light) you add, the closer you get to black (or actually a muddy brown). CMYK has a smaller range, or gamut, of colors it can reproduce than RGB does. What you can do about it:
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).

Video Tutorial How To Convert RGB To CMYK In Photoshop CC Without Flattening Image Want to watch along as I demonstrate this conversion technique? My super quick video tutorial above is at your service! Step-by-Step Tutorial Step 0 – Do not use image > mode to switch your document.

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.
I would not recommend to convert RGB vector content to CMYK in Photoshop because it is more intuitive. You will lose the resolution independence of the vectors and give it a specific resolution. The custom CMYK you mentioned is based on outdated technology from the early years of Photoshop.
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.
RGB is the color that is displayed on digital screens, such as the computer, laptop, phone, and TV, and it is also known as red, green, and blue. Most printers will automatically convert RGB files to CMYK without your knowledge. Because RGB is only available online, all digital and website content must be accessed via the Internet.
As a "test", I copied the AI RGB file and pasted it into a Photoshop Adobe RGB document, On-screen the AI file matched the PSD file side-by-side (so far). In Photoshop, I went to Mode>CMYK and the colors "slightly" shifted to a less saturated version (as expected), but totally usable for print (perceptually the same for most people without
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Testing on command line shows me that convert src.jpg -colorspace srgb out.jpg produces an image with bad colours, but convert src.jpg -profile AdobeRGB1998.icc -colorspace srgb out.jpg produces an image with good colours, and an 'icc' profile visible in identify -verbose output. I'm still playing with different ImageMagick versions, and cmd
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Then, select ‘Links and Images’ in the menu on the left to see a list of files or objects that are using RGB colours. Images will need to be opened in an image editor like Adobe Photoshop, converted to CMYK and then saved. Any imported files will also need opening in their original software, changing to CMYK and resaving. What You Need to Know. 8. If your digital camera creates 16-bit color images, convert to 8-bit 8 Bits/Channel , but only after converting to CMYK. 9. Record a Photoshop Action while converting an image and then use Batch. 2. Choose the CMYK setting based on paper and press type. 3. Convert a file from RGB to CMYK: CMYK. Even in Photoshop, you can't convert an image from RGB to CMYK and then back again without losing or altering some of the color information. EDIT: You mention a couple of times in your comments that you just want "RGB values in percentage." 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
03. Preview a CMYK version. If you want to keep your document and RGB workspace but you want to see what it looks like when you print it out, go into the View menu and choose proof colours. This will allow you to see the CMYK conversion without losing any of the RGB information.
An Adobe RGB display can have an edge over P3 in covering some extreme cyan colors, but if you’re currently using an sRGB display, a P3 display will still show you more of the CMYK color range than you’re seeing now. A P3 or Adobe RGB display can reproduce more colors of the FOGRA39 CMYK standard than an sRGB display, but Adobe RGB may be a 01. Find your image mode. Changing from RGB to CMYK is easy (Click the icon in the top right to enlarge the image) To reset your colour mode from RGB to CMYK in Photoshop, you need to go to Image > Mode. Here you'll find your colour options, and you can simply select CMYK. 02.
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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 JYdQ7.