CMYK is the color space used in Photoshop. To convert to CMYK, you will need to use the following steps:

  1. Choose the color space you want to convert to. In this case, we will choose CMYK.
  2. In the Colors palette, select the color you want to convert to CMYK from the list. We will use blue in this example.
  3. In the Conversion dialog, enter a value for each of the RGB channels in order to get a CMYK image. We will use 0% for all channels in this example so that everything is set up correctly.
  4. Click OK and your image should now be converted to CMYK!