RGB Color Model
The RGB color model is an additive color model that mixes red, green, and blue light in different ways to reproduce a broad range of colors. It is mainly used for image display in electronic systems such as TVs and computers.
The red, green, and blue channels are usually represented with values from 0 to 255, where 0 means no light in that channel and 255 means full intensity.
HEX is the hexadecimal notation for RGB channel values. A common form is #RRGGBB, for example #FF0000 means the red channel is at full strength while green and blue are 0.
HSL
HSL is one of the most common cylindrical-coordinate representations of the RGB color model. It makes color adjustment more intuitive than working directly with red, green, and blue light components.
HSL stands for hue, saturation, and lightness. Hue is typically expressed from 0 to 360 degrees; saturation ranges from 0% to 100%, where 0% is closer to gray and 100% is closer to a pure color; lightness also ranges from 0% to 100%, where 0% is black and 100% is white.
OKLCH
OKLCH is a perceptually uniform color space. Equal numeric changes in lightness or chroma feel more consistent to human vision, which makes it more controllable in design. It is the polar representation of the Oklab color space.
In OKLCH, LCH stands for lightness, chroma, and hue. Perceptual lightness ranges from 0 to 100%, where 0% is pure black and 100% is pure white. Chroma has no theoretical upper bound in OKLCH; 0 is gray and larger values are more vivid. Hue ranges from 0 to 360.