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canvas.\n\n[![npm](https://img.shields.io/npm/v/under-canvas.svg)](https://www.npmjs.com/package/under-canvas)\n[![CircleCI](https://img.shields.io/circleci/project/github/njbmartin/under-canvas.svg)](https://circleci.com/gh/njbmartin/under-canvas)\n[![GitHub issues](https://img.shields.io/github/issues/njbmartin/under-canvas.svg)](https://github.com/njbmartin/under-canvas/issues)\n[![GitHub license](https://img.shields.io/github/license/njbmartin/under-canvas.svg)](https://github.com/njbmartin/under-canvas/blob/master/LICENSE)\n\n---\n\nHave you ever wanted to preview an image before it gets uploaded? Or generate a thumbnail of an image on the fly?\n\n`Canvas` can be extremely powerful when it comes to manipulating images, but there's a lot of complexity just to perform seemingly easy tasks.\n\n**Under Canvas** makes it incredibly effortless to generate image previews from a number of different sources.\n\nThe function returns a `Promise`, which resolves to `base64` data URI.\n\n---\n\n## Installation\n\n```sh\nnpm install --save under-canvas\n```\n\n### ES6 import\n\n```js\nimport underCanvas from 'under-canvas';\n```\n\nAlternatively, you can use it directly in the browser:\n\n```html\n\u003cscript type='http://unpkg.com/under-canvas'\u003e\u003c/script\u003e\n```\n\n`underCanvas` is directly attached to the window:\n\n```js\nwindow.underCanvas()\n```\n\n---\n\n## Usage\n\n### External URL\n\n\u003e Note that manipulating images from a remote source requires `Access-Control-Allow-Origin` to be set.\n\n```js\nunderCanvas('http://localhost:8080/image.jpg').then((b64) =\u003e {\n  const img = document.createElement('img');\n  img.src = b64;\n  document.getElementById('root').appendChild(img);\n})\n```\n\n### Base-64 encoded image\n\n```js\nunderCanvas('data:image/png;base64,...').then((b64) =\u003e {\n  const img = document.createElement('img');\n  img.src = b64;\n  document.getElementById('root').appendChild(img);\n})\n```\n\n## API Usage\n\n### underCanvas(*image*, *[options]*)\n\nReturns a `Promise` which resolves a `base64` string of the preview.\n\n#### background\n\nType: `string`\n\nBackground colour to use if not transparent. Useful when scaling to fit images.\n\n\u003e Defaults to `transparent`.\n\n#### format\n\nType: `string`\nDefault: `image/png`\n\nFormat of the image to export.\n\n\u003e Supports a number of different image formats (dependant on browser). eg. `image/jpeg` and `image/png` are supported by all browsers, but **Chrome** also supports `image/webp`.\n\n#### quality\n\nType: `number`\nDefault: `0.9`\n\n#### width\n\nType: `number`\n\nWidth of the exported image.\n\n\u003e Defaults to original size.\n\n#### height\n\nType: `number`\n\nHeight of the exported image.\n\n\u003e Defaults to original size.\n\n#### crop\n\nType: `boolean`\nDefault: `false`\n\nResizes the image to fill the size and crops excess edges.\n\n\u003e By default, the original image will be resized to fit within the specified size, ensuring the image is fully visible and no cropping occurs. If crop is set to `true`, the image will be resized to ensure that the width and height are greater than or equal to the expected size.\n\n## Planned features\n\n- Generating previews from `input[type=file]`\n- Detect browser support for `Canvas`\n- `nodeJS` support using `node-canvas`\n\n## Contributing\n\nContributions are certainly welcome. Please take a look at any [existing issues](https://github.com/njbmartin/preview-image/issues).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnjbmartin%2Funder-canvas","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fnjbmartin%2Funder-canvas","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnjbmartin%2Funder-canvas/lists"}