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node_modules/imagemin-optipng/readme.md

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+# imagemin-optipng [![Build Status](http://img.shields.io/travis/imagemin/imagemin-optipng.svg?style=flat)](https://travis-ci.org/imagemin/imagemin-optipng)
+
+> Imagemin plugin for OptiPNG
+
+
+## Install
+
+```
+$ npm install imagemin-optipng
+```
+
+
+## Usage
+
+```js
+const imagemin = require('imagemin');
+const imageminOptipng = require('imagemin-optipng');
+
+(async () => {
+	await imagemin(['images/*.png'], 'build/images', {
+		use: [
+			imageminOptipng()
+		]
+	});
+
+	console.log('Images optimized!');
+})();
+```
+
+
+## API
+
+### imageminOptipng(options?)(buffer)
+
+Returns a `Promise<Buffer>`.
+
+#### options
+
+Type: `object`
+
+##### optimizationLevel
+
+Type: `number`<br>
+Default: `3`
+
+Select an optimization level between `0` and `7`.
+
+> The optimization level 0 enables a set of optimization operations that require minimal effort. There will be no changes to image attributes like bit depth or color type, and no recompression of existing IDAT datastreams. The optimization level 1 enables a single IDAT compression trial. The trial chosen is what. OptiPNG thinks it’s probably the most effective. The optimization levels 2 and higher enable multiple IDAT compression trials; the higher the level, the more trials.
+
+Level and trials:
+
+1. 1 trial
+2. 8 trials
+3. 16 trials
+4. 24 trials
+5. 48 trials
+6. 120 trials
+7. 240 trials
+
+##### bitDepthReduction
+
+Type: `boolean`<br>
+Default: `true`
+
+Apply bit depth reduction.
+
+##### colorTypeReduction
+
+Type: `boolean`<br>
+Default: `true`
+
+Apply color type reduction.
+
+##### paletteReduction
+
+Type: `boolean`<br>
+Default: `true`
+
+Apply palette reduction.
+
+##### errorRecovery
+
+Type: `boolean`<br>
+Default: `true`
+
+A reasonable amount of effort will be spent to try to recover as much data as possible of a broken image, but the success cannot generally be guaranteed.
+
+#### buffer
+
+Type: `Buffer`
+
+Buffer to optimize.