Prisma is a rust library aimed to be a comprehensive set of color representations, manipulations, conversions and algorithms that are easy to use for projects of all levels. Prisma follows a model of "opt-in" complexity, meaning that if you just want a library to convert from Rgb to Hsv and back, prisma will let you do it with minimal knowledge of color science. If you need to access the CIE spaces or do color space conversions however, prisma also provides that functionality with wrappers to use the type system to enforce validity.
Prisma aims to be the go-to source for color conversions and color science in rust. It is currently a work in progress, and any contributions or feature requests are appreciated.
Currently prisma supports the following color models:
Rgb- The standard color model for displaysRgi- A chromaticity model constructed from Rgb that decouples chromaticity and lightnessHsv- Hue, saturation, value: a more intuitive polar Rgb modelHsl- Hue, saturation, lightness: an alternate to Hsv fulfilling similar rolesHsi- Hue, saturation, intensity: a hue-based model without distortioneHsi- An extension toHsithat rescaled saturation to avoid going out of gamut in RgbHwb- Hue, whiteness, blackness: a hue-based model made to be easy for users to select colors inYCbCr- A representation of the various YUV and YIQ models used in display and broadcast
Xyz- The "parent" absolute color space other color spaces are defined in terms ofLms- A color space simulating human cone responseLab- A uniform perception color space transformation of XYZLchab- A polar transformation of Lab. A uniform perception analog of HslLuv- An alternative uniform perception color space useful in lighting calculationsLchuv- A polar transformation of Luv
Prisma also supports these color spaces with an alpha channel via the Alpha type.
Currently, there are two main color libraries for rust:
-
color --
coloris a very old library that hasn't been updated in several years. While it works for conversion through a few color spaces, and is easy to use, it has a very minimal set of features. -
palette --
palettehas significantly more features and can go into a few of the CIE spaces, but requiring all computations to be done in linear encoding is a serious drawback, as if you just want a nice looking gradient in a game, linear Hsv will not get you that. It also is built on predefined models and doesn't support dynamic configuration.prismasupports considerably more color spaces, as well as multiple encodings and spaces which can be built at runtime.prismaalso does not require you to specify a color space, as most applications don't really care and use the device color space or sRgb.
Prisma aims to support all the features of the above libraries, while making it up to the user how much complexity they need.
#[macro_use] extern crate approx;
extern crate angular_units as angle;
# extern crate prisma;
use prisma::{Rgb, Hsv, FromColor};
use angle::Deg;
let rgb = Rgb::new(0.5, 0.75, 1.0);
let mut hsv = Hsv::from_color(&rgb);
hsv.set_hue(Deg(180.0));
let rgb = Rgb::from_color(&hsv);
assert_relative_eq!(rgb, Rgb::new(0.5, 1.0, 1.0), epsilon=1e-6);#[macro_use] extern crate approx;
extern crate angular_units as angle;
# extern crate prisma;
use prisma::{Rgb, Hsl, FromColor, Lerp};
use angle::Deg;
let rgb1 = Rgb::new(0.8, 0.25, 0.0f32);
let rgb2 = Rgb::new(0.5, 0.66, 1.0);
// Specify the hue channel should use degrees
let hsl1: Hsl<_, Deg<f32>> = Hsl::from_color(&rgb1);
let hsl2 = Hsl::from_color(&rgb2);
// Note that hue channels will interpolate in the shortest direction. This is usually
// the expected behavior, but you can always go forward with `lerp_flat`.
let rgb_out = Rgb::from_color(&hsl1.lerp(&hsl2, 0.35));
assert_relative_eq!(rgb_out, Rgb::new(1.0, 0.045, 0.62648), epsilon=1e-4);#[macro_use] extern crate approx;
# extern crate prisma;
use prisma::Rgb;
let rgb_in = Rgb::new(100, 200, 255u8);
let rgb_out: Rgb<f32> = rgb_in.color_cast();
assert_relative_eq!(rgb_out, Rgb::new(0.39216, 0.78431, 1.0), epsilon=1e-4);#[macro_use] extern crate approx;
# extern crate prisma;
use prisma::Rgb;
use prisma::encoding::{EncodableColor, TranscodableColor, SrgbEncoding};
// This returns a `EncodedColor<Rgb<f32>, SrgbEncoding>`
// Note: no encodind is done. `srgb_encoded` says that this value is already in sRgb encoding.
let rgb_srgb = Rgb::new(0.5, 1.0, 0.25f32).srgb_encoded();
// Decode goes from an encoding to linear.
let rgb_linear = rgb_srgb.clone().decode();
assert_relative_eq!(rgb_linear, Rgb::new(0.21404, 1.0, 0.05088).linear(), epsilon=1e-4);
// We can then go back with `encode`
let rgb_out = rgb_linear.encode(SrgbEncoding);
assert_relative_eq!(rgb_out, rgb_srgb, epsilon=1e-6);#[macro_use] extern crate approx;
# extern crate prisma;
use prisma::{Rgb, Xyz};
use prisma::encoding::{EncodableColor, TranscodableColor};
use prisma::color_space::{ColorSpace, EncodedColorSpace, NamedColorSpace, ConvertToXyz};
use prisma::color_space::presets::sRgb;
let rgb = Rgb::new(0.25, 0.5, 0.75f32).srgb_encoded();
let color_space = sRgb::get_color_space();
// In this case, since rgb and color_space know their own encodings, the conversion to linear
// is automatic.
let xyz = color_space.convert_to_xyz(&rgb);
assert_relative_eq!(xyz, Xyz::new(0.191803, 0.201605, 0.523050), epsilon=1e-5);
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