Module colorizer.color
Provides color conversion and utility functions for RGB and HSL values.
Functions
| hsl_to_rgb (h, s, l) | Converts an HSL color value to RGB. |
| hue_to_rgb (p, q, t) | Converts an HSL component to RGB, used within `hsl_to_rgb`. |
| is_bright (r, g, b) | Determines whether a color is bright, helping decide text color. |
Functions
- hsl_to_rgb (h, s, l)
-
Converts an HSL color value to RGB.
Accepts hue, saturation, and lightness values, each within the range [0, 1],
and converts them to an RGB color representation with values scaled to [0, 255].
Parameters:
- h number: Hue, in the range [0, 1].
- s number: Saturation, in the range [0, 1].
- l number: Lightness, in the range [0, 1].
Returns:
- number|nil,number|nil,number|nil: Returns red, green, and blue values scaled to [0, 255], or nil if any input value is out of range.
- number|nil,number|nil,number|nil
- hue_to_rgb (p, q, t)
-
Converts an HSL component to RGB, used within `hsl_to_rgb`.
Source: https://gist.github.com/mjackson/5311256
This function computes one component of the RGB value by adjusting
the color based on intermediate values `p`, `q`, and `t`.
Parameters:
- p number: A helper variable representing part of the lightness scale.
- q number: Another helper variable based on saturation and lightness.
- t number: Adjusted hue component to be converted to RGB.
Returns:
-
number: The RGB component value, in the range [0, 1].
- is_bright (r, g, b)
-
Determines whether a color is bright, helping decide text color.
ref: https://stackoverflow.com/a/1855903/837964
https://stackoverflow.com/questions/596216/formula-to-determine-brightness-of-rgb-color
Calculates the perceived luminance of the RGB color. Returns `true` if
the color is bright enough to warrant black text and `false` otherwise.
Formula based on the human eye’s sensitivity to different colors.
Parameters:
- r number: Red component, in the range [0, 255].
- g number: Green component, in the range [0, 255].
- b number: Blue component, in the range [0, 255].
Returns:
-
boolean: `true` if the color is bright, `false` if it's dark.