COLOR RAMP FORMULATOR

Color Ramp Formulator is an open-source desktop application used to generate algorithmically-defined color ramps, making use of formulas.

This application is built with Electron, and works on macOS, Linux and Windows operating systems.

Examples

CubeHelix (Destiny)

cubehelix_color (1 - t, 0, 0.4, 0.8, 1, [ 0.15, 0.85 ])

Diverging

rgb_t
(
    cos ((t - 2/6) * PI),
    cos ((t - 3/6) * PI),
    cos ((t - 4/6) * PI)
)

Fancy (Ternary)

rgb
(
    (x < 127.5) ? 255 - (2 * x) : (2 * x) - 255,
    (x < 127.5) ? 1.5 * x : 127.5 + (0.5 * x),
    (x < 127.5) ? 127.5 + (0.5 * (255 - x)) : 1.5 * (255 - x)
)

Green Sequential (Discrete)

discrete_colors
(
    [
        "#085A32",
        "#118649",
        "#18A85A",
        "#52B974",
        "#9ECF8A",
        "#D2E3A2",
        "#F0F1BA",
        "#F7F8E5"
    ],
    [ 0, 255 ], x
)

Iron (YCbCr)

ycbcr_t
(
    lerp (0.059, 0.886, t),
    cubic ([ 5.99477, -8.68926, 2.53768, 0.550188 ], t),
    cubic ([ 0.683558, -2.49828, 1.94276, 0.383144 ], t)
)

Navajo White (Transformed)

transform_color
(
    "navajo_white",
    0, lerp (1, 2, t), lerp (1, 1/3, t)
)

Parakeet (CubeHelix)

interpolate_colors
(
    [
        [ 0/3, cubehelix (260, 60, 35) ],
        [ 2/3, cubehelix (80, 120, 75) ],
        [ 3/3, "gold" ]
    ],
    t,
    "cubehelix-dec", [ 100, 0, 0 ]
)

Radiancy (HSL)

distribute_colors
(
    [ "#2A4858", "#FAFA6E", "#2A4858" ],
    [ 0, 1 ], t,
    "hsl-far", [ 0, 100, 0 ]
)

Two-Sided Color Bar

hsv
(
    t < 0.5 ? lerp (240, 120, t) : lerp (60, -60, t - 0.5),
    100,
    100
)

Yellow to Blue

hcl_t
(
    1/9 + 1/6 + (t / 2),
    0.5,
    1 - pow (t, 1.5)
)

Yellow to Red (Wavelengths)

wavelength_color (lerp (580, 645, t))

Using

You can download the latest release for macOS.

Building

You'll need Node.js (which comes with npm) installed on your computer in order to build this application.

Clone method

# Clone the repository
git clone https://github.com/tonton-pixel/color-ramp-formulator
# Go into the repository
cd color-ramp-formulator
# Install dependencies
npm install
# Run the application
npm start

Note: to use the clone method, the core tool git must also be installed.

Download method

If you don't wish to clone, you can download the source code, unZip it, then directly run the following commands from a Terminal opened at the resulting color-ramp-formulator-master folder location:

# Install dependencies
npm install
# Run the application
npm start

Packaging

Several scripts are also defined in the package.json file to build OS-specific bundles of the application, using the simple yet powerful Electron Packager Node module.
For instance, running the following command (once the dependencies are installed) will create a Color Ramp Formulator.app version for macOS:

# Build macOS (Darwin) application
npm run build-darwin

License

The MIT License (MIT).