{"maintainers":[{"name":"1000ch","email":"shogo.sensui@gmail.com"},{"name":"bradbaris","email":"bradbaris@gmail.com"},{"name":"kevva","email":"kevinmartensson@gmail.com"},{"name":"shinnn","email":"snnskwtnb@gmail.com"},{"name":"sindresorhus","email":"sindresorhus@gmail.com"}],"keywords":["compress","image","imageminplugin","img","minify","optimize","optipng","png"],"dist-tags":{"latest":"5.2.1"},"author":{"name":"Kevin Mårtensson","email":"kevinmartensson@gmail.com","url":"github.com/kevva"},"description":"OptiPNG imagemin plugin","readme":"# imagemin-optipng [![Build Status](http://img.shields.io/travis/imagemin/imagemin-optipng.svg?style=flat)](https://travis-ci.org/imagemin/imagemin-optipng) [![Build status](https://ci.appveyor.com/api/projects/status/4e5msglic4m7yxst?svg=true)](https://ci.appveyor.com/project/ShinnosukeWatanabe/imagemin-optipng)\n\n> optipng image-min plugin\n\n\n## Install\n\n```\n$ npm install --save imagemin-optipng\n```\n\n\n## Usage\n\n```js\nconst imagemin = require('imagemin');\nconst imageminOptipng = require('imagemin-optipng');\n\nimagemin(['images/*.png'], 'build/images', {use: [imageminOptipng()]}).then(() => {\n\tconsole.log('Images optimized');\n});\n```\n\n\n## API\n\n### imageminOptipng([options])(buffer)\n\nReturns a `Promise` for a `Buffer`.\n\n#### options\n\n##### optimizationLevel\n\nType: `number`<br>\nDefault: `3`\n\nSelect an optimization level between `0` and `7`.\n\n> 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.\n\nLevel and trials:\n\n1. 1 trial\n2. 8 trials\n3. 16 trials\n4. 24 trials\n5. 48 trials\n6. 120 trials\n7. 240 trials\n\n##### bitDepthReduction\n\nType: `boolean`<br>\nDefault: `true`\n\nApply bit depth reduction.\n\n##### colorTypeReduction\n\nType: `boolean`<br>\nDefault: `true`\n\nApply color type reduction.\n\n##### paletteReduction\n\nType: `boolean`<br>\nDefault: `true`\n\nApply palette reduction.\n\n#### buffer\n\nType: `Buffer`\n\nBuffer to optimize.\n\n\n## License\n\nMIT © 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