Settings - CMYK to RGB conversion

First of all, what is CMYK? And RGB? 

Both are color models. A color model is a system that uses a specific set of primary colors to create a larger range of colors. The most known color models are RGB and CMYK.

• The RGB color model is an additive color model, which means colors get lighter when mixed. As each component of light is mixed in, the combination becomes a new color. Red, green and blue are the three additive primaries. You can create any color within the constraint of the device using different combinations of the additive primaries. When you mix all three together in balanced amounts, you get white. (Source)

• CMYK is a subtractive color model, which means colors get darker when mixed. Each of the mixed paints or inks absorbs different components of the light. If the right combination of paints is mixed together, all of the components of light are absorbed and the result is a near-black. (Source)

CMYK (Cyan, Magenta, Yellow, Key/Black) is the color model used for printed materials, while the RGB model is used when working with digital screen-based designs, such as those viewed on a computer screen or phone display. RGB images are also smaller than CMYK, so if you know that your images are only going to be displayed on a screen, it is safe and recommended to convert them to RGB.