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imagedata-filters\n\nimagedata-filters is a JavaScript library to operate canvas imagedata. It similar to [css3 filter function](https://developer.mozilla.org/en-US/docs/Web/CSS/filter).\n\n\n[中文文档](#%E4%B8%AD%E6%96%87%E6%96%87%E6%A1%A3)\n\n## Install\n\nVia npm\n\n```\n$ npm i imagedata-filters\n```\n\nOr download [imagedata-filtes.min.js](https://github.com/klouskingsley/imagedata-filters/raw/master/dist/imagedata-filters.min.js) and include in your HTML\n\n## Usage\n\n```html\n\n\u003cimg src=\"./example/atx.jpg\" id=\"originImg\"\u003e\n\u003ccanvas id=\"filterImg\" width=\"800\" height=\"800\"\u003e\n\n\u003cscript src=\"./dist/imagedata-filters.min.js\"\u003e\u003c/script\u003e\n\u003cscript\u003e\n    var originImg = document.getElementById('originImg')\n    var filterImg = document.getElementById('filterImg')\n    var filterCtx = filterImg.getContext('2d')\n\n    filterCtx.drawImage(originImg, 0, 0)\n\n    var imageData = filterCtx.getImageData(0, 0, filterImg.width, filterImg.height), {amount: 1.2}\n\n    imagedataFilters.contrast(imageData, {amount: '1.2'})    // change imageData directly cause imageData.data is readonly\n\n    filterCtx.putImageData(imageData, 0, 0)\n\n\u003c/script\u003e\n\n```\n\n## Api\n\nAll the apis is similar to css3 filter function, the difference between css3 filter function and imagedata-filters function is that css3 function's argument is a css number value but imagedata-filters function's argument is an object which contains a key `amount` which is relevant to the css number value in css3 filter function.\n\n### .brightness(*imageData*, options)\n\n### .contrast(*imageData*, options)\n\n### .grayscale(*imageData*, options)\n\n### .hueRotate(*imageData*, options)\n\n`options.amount` is a value of radian, this is different from css3 hue-rorate.\n\n### .invert(*imageData*, options)\n\n### .opacity(*imageData*, options)\n\n### .saturate(*imageData*, options)\n\n### .sepia(*imageData*, options)\n\n### .blur(*imageData*, options)\n\n\u003e use `blur` carefully, because Gaussiam blur compute may has a performance issue with the increase of `options.amount`\n\n## License\n\nMIT\n\n\n\n# 中文文档\n\n## 安装\n\n通过npm安装\n\n```\n$ npm i imagedata-filters\n```\n\n或者直接下载[imagedata-filtes.min.js](https://github.com/klouskingsley/imagedata-filters/raw/master/dist/imagedata-filters.min.js)并嵌入你的HTML页面中\n\n## 使用\n\n```html\n\n\u003cimg src=\"./example/atx.jpg\" id=\"originImg\"\u003e\n\u003ccanvas id=\"filterImg\" width=\"800\" height=\"800\"\u003e\n\n\u003cscript src=\"./dist/imagedata-filters.min.js\"\u003e\u003c/script\u003e\n\u003cscript\u003e\n    var originImg = document.getElementById('originImg')\n    var filterImg = document.getElementById('filterImg')\n    var filterCtx = filterImg.getContext('2d')\n\n    filterCtx.drawImage(originImg, 0, 0)\n\n    var imageData = filterCtx.getImageData(0, 0, filterImg.width, filterImg.height), {amount: 1.2}\n\n    imagedataFilters.contrast(imageData, {amount: '1.2'})    // 因为imageData.data是只读的，所以这里会直接修改imageData.data\n\n    filterCtx.putImageData(imageData, 0, 0)\n\n\u003c/script\u003e\n\n```\n\n## Api\n\n所有的api都和css3 filter中的函数类似，不同的是，css3 fitler函数的参数是一个css数值, 而imagedata-filters函数中的`options`是一个对象，它有一个`amount`的key，对应着css3 filter里面的那个参数.\n\n### .brightness(*imageData*, options)\n\n### .contrast(*imageData*, options)\n\n### .grayscale(*imageData*, options)\n\n### .hueRotate(*imageData*, options)\n\n`options.amount`是一个弧度值，这一点与css3 hue-rorate不同。\n\n### .invert(*imageData*, options)\n\n### .opacity(*imageData*, options)\n\n### .saturate(*imageData*, options)\n\n### .sepia(*imageData*, options)\n\n### .blur(*imageData*, options)\n\n\u003e 使用`blur`时注意，因为随着`options.amount`的增大，高斯模糊的计算可能会有性能问题.\n\n\n## License\n\nMIT","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fklouskingsley%2Fimagedata-filters","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fklouskingsley%2Fimagedata-filters","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fklouskingsley%2Fimagedata-filters/lists"}