deltae

Calculate Delta E between two colors in CIE Lab space

9 releases

 0.3.2 Jul 25, 2023 Apr 8, 2023 Jul 31, 2021 Nov 11, 2019 Apr 27, 2019

#9 in Multimedia

Used in 24 crates (4 directly)

2MB
972 lines

Contains (WOFF font, 290KB) noto-sans-kr-v13-korean-regular.woff, (WOFF font, 190KB) docs/doc/FiraSans-Medium.woff, (WOFF font, 135KB) docs/doc/FiraSans-Medium.woff2, (WOFF font, 185KB) docs/doc/FiraSans-Regular.woff, (WOFF font, 130KB) docs/doc/FiraSans-Regular.woff2, (WOFF font, 69KB) docs/doc/SourceCodePro-Regular.ttf.woff and 11 more.

deltae

Library

A rust library for converting colors and calculating DeltaE (color difference).

Check out the documentation here: Rust API Documentation

...or compile it yourself:

``````cargo doc --open
``````

Examples

``````use std::error::Error;
use deltae::*;

fn main() -> Result<(), Box<dyn Error>>{
// Lab from a string
let lab0: LabValue = "89.73, 1.88, -6.96".parse()?;
// Lab directly from values
let lab1 = LabValue {
l: 95.08,
a: -0.17,
b: -10.81,
}.validate()?; // Validate that the values are in range

// Create your own Lab type
#[derive(Clone, Copy)]
struct MyLab(f32, f32, f32);

// Types that implement Into<LabValue> also implement the Delta trait
impl From<MyLab> for LabValue {
fn from(mylab: MyLab) -> Self {
LabValue { l: mylab.0, a: mylab.1, b: mylab.2 }
}
}
let mylab = MyLab(95.08, -0.17, -10.81);

// Implement DeltaEq for your own types
impl<D: Delta + Copy> DeltaEq<D> for MyLab {}

// Assert that colors are equivalent within a tolerance
assert_delta_eq!(mylab, lab1, DE2000, 0.0, "mylab is not equal to lab1!");

// Calculate DeltaE between two lab values
let de0 = DeltaE::new(lab0, lab1, DE2000);
// Use the Delta trait
let de1 = lab0.delta(lab1, DE2000);
assert_eq!(de0, de1);

// Convert to other color types
let lch0 = LchValue::from(lab0);
let xyz0 = XyzValue::from(lab1);
// If DE2000 is less than 1.0, the colors are considered equivalent
assert!(lch0.delta_eq(lab0, DE2000, 1.0));
assert!(xyz0.delta_eq(lab1, DE2000, 1.0));

// Calculate DeltaE between different color types
let de2 = lch0.delta(xyz0, DE2000);
assert_eq!(de2.round_to(4), de0.round_to(4));
// There is some loss of accuracy in the conversion.
// Usually rounding to 4 decimal places is more than enough.

// Recalculate DeltaE with different method
let de3 = de2.with_method(DE1976);

println!("{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n",
lab0, // [L:89.73, a:1.88, b:-6.96]
lab1, // [L:95.08, a:-0.17, b:-10.81]
lch0, // [L:89.73, c:7.2094383, h:285.11572]
xyz0, // [X:0.84574246, Y:0.8780792, Z:0.8542397]
de0,  // 5.316941
de1,  // 5.316941
de2,  // 5.316937
de3,  // 6.902717
);

Ok(())
}
``````

Example

The example binary included with this library is a command line application that calculates Delta E between to Lab colors.

Usage

``````deltae 0.2.1
Ryan O'Beirne <ryanobeirne@gmail.com>
Calculate Delta E between two colors in CIE Lab space.

USAGE:
deltae [OPTIONS] <COLOR0> <COLOR1>

FLAGS:
-h, --help       Prints help information
-V, --version    Prints version information

OPTIONS:
-c, --color-type <COLORTYPE>    Set color type [default: lab]  [possible values: lab, lch, xyz]
-m, --method <METHOD>           Set DeltaE method [default: 2000]  [possible values: 2000, 1994, 1994T, CMC1, CMC2,
1976]

ARGS:
<COLOR0>    Reference color values
<COLOR1>    Sample color values
``````

Example

``````deltae --method=de1976 "89.73, 1.88, -6.96" "95.08, -0.17, -10.81"
``````

Install

``````git clone https://gitlab.com/ryanobeirne/deltae
cd deltae
cargo install --example=deltae --path=. --force
``````

Notes

Calculates DE2000, DE1994 (Graphic Arts and Textiles), DECMC (with a tolerance for lightness and chroma), and DE1976. The Default is DE2000.