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+# UnRGBA [![Build Status][ci-img]][ci]
+
+<img align="right" width="135" height="95" src="http://postcss.github.io/postcss/logo-leftp.png" title="Philosopher’s stone, logo of PostCSS">
+
+[UnRGBA] changes `rgba()` values to hex. This can be useful for outputting CSS for older browsers like Internet Explorer 8.
+
+```css
+/* before */
+
+.hero {
+	background: rgba(153, 221, 153, .8);
+	border: solid 1px rgba(100, 102, 103, .8);
+	border-right-color: rgba(100, 102, 103, 0);
+}
+
+/* after */
+
+.hero {
+	background: #99dd99;
+	border: solid 1px #646667;
+	border-right-color: transparent;
+}
+```
+
+## Usage
+
+Add [UnRGBA] to your build tool:
+
+```bash
+npm install postcss-unrgba --save-dev
+```
+
+#### Node
+
+```js
+require('postcss-unrgba')({ /* options */ }).process(YOUR_CSS);
+```
+
+#### PostCSS
+
+Add [PostCSS] to your build tool:
+
+```bash
+npm install postcss --save-dev
+```
+
+Load [UnRGBA] as a PostCSS plugin:
+
+```js
+postcss([
+    require('postcss-unrgba')({ /* options */ })
+]);
+```
+
+#### Gulp
+
+Add [Gulp PostCSS] to your build tool:
+
+```bash
+npm install gulp-postcss --save-dev
+```
+
+Enable [UnRGBA] within your Gulpfile:
+
+```js
+var postcss = require('gulp-postcss');
+
+gulp.task('css', function () {
+    return gulp.src('./css/src/*.css').pipe(
+        postcss([
+            require('postcss-unrgba')({ /* options */ })
+        ])
+    ).pipe(
+        gulp.dest('./css')
+    );
+});
+```
+
+#### Grunt
+
+Add [Grunt PostCSS] to your build tool:
+
+```bash
+npm install grunt-postcss --save-dev
+```
+
+Enable [UnRGBA] within your Gruntfile:
+
+```js
+grunt.loadNpmTasks('grunt-postcss');
+
+grunt.initConfig({
+    postcss: {
+        options: {
+            processors: [
+                require('postcss-unrgba')({ /* options */ })
+            ]
+        },
+        dist: {
+            src: 'css/*.css'
+        }
+    }
+});
+```
+
+## Options
+
+#### `method`
+
+Type: `String`  
+Default: `'replace'`
+
+##### `clone`
+Copies any properties with `rgba` values to new properties using hex.
+```css
+/* before */
+
+.hero {
+	background: rgba(153, 221, 153, .8);
+}
+
+/* after */
+
+.hero {
+	background: #99dd99;
+	background: rgba(153, 221, 153, .8);
+}
+```
+
+##### `replace`
+Copies any properties with `rgba` values to new properties using hex while removing the original.
+```css
+/* before */
+
+.hero {
+	background: rgba(153, 221, 153, .8);
+}
+
+/* after */
+
+.hero {
+	background: #99dd99;
+}
+```
+
+##### `warn`
+Warns whenever a property with an `rgba` value is found.
+
+#### `filter`
+
+Type: `Boolean`  
+Default: `false`
+
+##### `true`
+Uses the Internet Explorer proprietary filter to preserve alpha-transparent backgrounds.
+```css
+/* before */
+
+.hero {
+	background: rgba(153, 221, 153, .8);
+}
+
+/* after */
+
+.hero {
+	filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,startColorstr='#8099dd99',endColorstr='#8099dd99');
+}
+```
+
+##### `false`
+Uses regular hexadecimal values when processing backgrounds.
+```css
+/* before */
+
+.hero {
+	background: rgba(153, 221, 153, .8);
+}
+
+/* after */
+
+.hero {
+	background: #99dd99;
+}
+```
+
+#### `properties`
+
+Type: `Array`  
+Default: `['background', 'background-color', 'color', 'border', 'border-bottom', 'border-bottom-color', 'border-color', 'border-left', 'border-left-color', 'border-right', 'border-right-color', 'border-top', 'border-top-color', 'outline', 'outline-color']`
+
+Specifies the properties on which rgba values will be processed. If a falsey value is passed then all properties will be processed.
+
+[ci]: https://travis-ci.org/jonathantneal/postcss-unrgba
+[ci-img]: https://travis-ci.org/jonathantneal/postcss-unrgba.svg
+[Gulp PostCSS]: https://github.com/postcss/gulp-postcss
+[Grunt PostCSS]: https://github.com/nDmitry/grunt-postcss
+[PostCSS]: https://github.com/postcss/postcss
+[UnRGBA]: https://github.com/jonathantneal/postcss-unrgba