In the end, it is best to let your taste buds decide how much dried oregano you should use in your recipe. Also keep in mind that a packet of dried oregano that has been lying on your shelf for several months provides less flavor than a packet of oregano that you have purchased recently.
You can certainly choose a CMYK or HSL dialog in the fill and stroke and all colour pickers, but it converts all colors to 8 digit hex as you willl see in the bottom of the picker. Since RGB and CMYK spaces are both device-dependent spaces, there is no simple or general conversion formula that converts between them.
Color channels in the original image become spot color channels in the converted image. Converting a CMYK image to Multichannel mode creates cyan, magenta, yellow, and black spot channels. Converting an RGB image to Multichannel mode creates cyan, magenta, and yellow spot channels. Deleting a channel from an RGB, CMYK, or Lab image automatically converts the image to Multichannel mode, flattening layers. To export a multichannel image, save it in Photoshop DCS 2.0 format.