---
name: "al_color_lch"
section: "3alleg5"
platform: "linux"
package: "allegro5-doc"
version: "2:5.2.10.1+dfsg-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/al_color_lch/3alleg5"
---

# al\_color\_lch(3alleg5)

Allegro 5 API

## NAME

al\_color\_lch - Allegro 5 API

## SYNOPSIS

-

  ```
  #include <allegro5/allegro_color.h>
  ALLEGRO_COLOR al_color_lch(float l, float c, float h)
  ```

## DESCRIPTION

Return an ALLEGRO\_COLOR(3alleg5) structure from CIE LCH values. LCH colors are very similar to HSL, with the same meaning of L and H and C corresponding to S. However LCH is more visually uniform. Furthermore, this function expects the angle for H in radians and not in degree.

The CIE LCH color space is a cylindrical representation of the L\*a\*b\* color space. The L component is the same and C and H are computed like this:

-

  ```
  C = sqrt(a * a + b * b)
  H = atan2(b, a)
  ```

## SINCE

5\.2.3

## SEE ALSO

al\_color\_lch\_to\_rgb(3alleg5), al\_color\_rgb\_to\_lch(3alleg5)