gm-tools

gm-tools

Friendly tools for interacting with GraphicsMagick.

:cloud: Installation

# Using npm
npm install --save gm-tools

# Using yarn
yarn add gm-tools

:clipboard: Example

const gmTools = require("gm-tools");

let img = gmTools(__dirname + "/octocat.jpg");

// Get all the pixels
img.pixels((err, pixels) => {
    console.log(err || pixels);
    // [ PixelClass { r: 34, g: 30, b: 31, a: 2.55 },
    //   PixelClass { r: 34, g: 30, b: 31, a: 2.55 },
    //   PixelClass { r: 34, g: 30, b: 31, a: 2.55 },
    //   ...
    //   PixelClass { r: 241, g: 241, b: 243, a: 2.55 },
    //   ...
    //   PixelClass { r: 191, g: 189, b: 190, a: 2.55 },
    //   PixelClass { r: 195, g: 191, b: 192, a: 2.55 },
    //   PixelClass { r: 92, g: 90, b: 91, a: 2.55 },
    //   PixelClass { r: 32, g: 30, b: 31, a: 2.55 },
    //   PixelClass { r: 32, g: 30, b: 31, a: 2.55 },
    //   ...
    //   PixelClass { r: 34, g: 30, b: 31, a: 2.55 } ]
});

// Get pixel at given coordinates
img.getPixel(0, 0, (err, pixel) => {
    console.log(err || pixel);
    // PixelClass { r: 34, g: 30, b: 31, a: 2.55 }
});

:question: Get Help

There are few ways to get help:

• Please post questions on Stack Overflow. You can open issues with questions, as long you add a link to your Stack Overflow question.
• For bug reports and feature requests, open issues. :bug:
• For direct and quick help, you can use Codementor. :rocket:

:memo: Documentation

GmParser(input, cb)

Creates a new instance of GmParser.

Params

• String|Buffer|GraphicsMagick input: The path to an image file, the image buffer or an existing GraphicsMagick object.
• Function cb: The callback function.

resize(width, height)

Resizes the image.

Params

• Number width: The size width.
• Number height: The size height.

parse(cb)

Parses the image internally.

Params

• Function cb: The callback function.

getSize(cb)

Gets the image size. This appends the width and height functions to the GmParser instance that return the width and height of the image.

Params

• Function cb: The callback function.

toPNGBuffer(cb)

Converts the image into a buffer that is parsed by pngjs.

Params

• Function cb: The callback function.

pixels(buffer, cb)

Gets all the image pixels.

Params

• Buffer buffer: An optional pngjs buffer. If provided, the pixels array will be returned.
• Function cb: The callback function.

Return

• Array An array of pixels (only if the buffer argument is provided).

getPixel(x, y, buffer, cb)

Gets the pixel data at given coordinates.

Params

• Number x: The x coordinate.
• Number y: The y coordinate.
• Buffer buffer: An optional pngjs buffer. If provided, the pixels array will be returned.
• Function cb: The callback function.

Return

• Pixel A Pixel instance. This will be returned only if the buffer argument is provided.

gmTools(input, cb)

Friendly tools for interacting with graphicsmagick

Params

• String|Buffer|GraphicsMagick input: The path to an image file, the image buffer or an existing GraphicsMagick object.
• Function cb: The callback function.

Return

• GmParser The GmParser instance.

:yum: How to contribute

Have an idea? Found a bug? See how to contribute.

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:dizzy: Where is this library used?

If you are using this library in one of your projects, add it in this list. :sparkles:

• image-parser

:scroll: License

MIT © Ionică Bizău