EXA Color

𝔼𝕏tr𝔸 𝔼li𝕏ir 𝔸dditions (𝔼𝕏𝔸)

EXA project index: exa

Utilities for colors: 1-4 components, float/byte data types, color space conversions and named colors (CSS).

Module path: Exa.Color

Naming Convention

Modules are named with:

• digit for the number of components: 1, 2, 3, 4
• letter (lowercase) for the data type: b (byte), f (float)

For example, col3f is a 3-component color using unit float values, e.g. RGB.

Design

The design prefers plain (untagged) tuples for compact size and efficient O(1) access time (contiguous in memory).

Scalar 1-component colors are simple atomic types. Multi-component colors use tuples.

Colors used for images have a separate pixel type to label the components. The pixel format tag is not embedded in every color tuple.

CSS colors are loaded from a text file on demand. The look-up table is stored in the process dictionary. Every process that accesses CSS colors will have a copy.

Features

• Colors: 1,3,4 byte,float
• Color models: RGB, HSL
• Color maps: index => col3b
• Named CSS colors
• Pixels and components
• Conversion utilities: byte,float

Building

To bootstrap an exa_xxx library build, you must run mix deps.get twice.

EXA License

EXA source code is released under the MIT license.

EXA code and documentation are:
Copyright (c) 2024 Mike French