Utilities and Tools • Lua for Oklch

Click the input field, input a color code, and press the Enter key. You will see color circles and gradient bars in both Oklch and HSL color spaces based on the color you selected. The input field also accepts alpha components or transparency values. Located in the upper right corner is the icon which toggles between light and dark modes.

The skin is scalable. You can enlarge or shrink the skin to any size by changing the value of the "scaleFactor" variable at the Variables section in the .ini file.

Resources:

• Oklch color picker
  https://oklch.com/
• Color names and their color codes
  https://htmlcolorcodes.com/color-names/

oklch_color.lua

This file includes the following functions that handle Oklch color space:

• Get_LCH(color, specifier): Gets LCH values of an RGB color
  The second argument is optional. If the argument is either 'L', 'C', 'H', or 'A', the function returns only one value specified by the argument.
• Set_LCH(color, L, C, H, A): Sets LCH values of an RGB color to specified values
  In the LCH values, a letter '*' can be used as a placeholder which means "Do nothing."
• Shift_LCH(color, L, C, H, A): Shifts LCH values of an RGB color by specified amounts
  Like the above function, a letter '*' can be used as a placeholder instead of the LCH values.

The first argument color is a string that represents an RGB color. Both decimal and hexadecimal formats are accepted. In the second and third functions, using a letter '*' allows only specific values to be changed. Alpha components of color are optional in all these functions.

These functions can also be called directly from the skin's .ini file by using inline Lua.

That's it. Basically you should be able to manipulate color just by using these three functions. Lower level functions are also provided which allow more meticulous control of color. The example skin uses these lower level functions. The description of these functions are included in the file.

hsl_color.lua

This file includes HSL counterparts of the above functions. The description is omitted here because it is out of the scope of this post. Read the file for details.

hsv_color.lua

This file includes HSV counterparts of the above functions. The description is omitted here because it is out of the scope of this post. Read the file for details.

This file is not used anywhere. It is provided just for somebody who wants to use it and just in case someday I will want to use it.

At first, include the .lua file into your Lua script.
Then, use the functions above in any of your functions as follows (this snippet assumes that hue is shifted):