gulp common plug-ins use the gulp-imagemin

More gulp common plug-ins use please visit: gulp common plug-ins summary

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gulp-imagemin This is a narrow PNG, JPEG, GIF and SVG images plugins.

Greater use of the document, please click visit gulp-imagemin tool official website .

installation

A key installation much explanation

npm install --save-dev gulp-imagemin

use

Basic use:

const gulp = require('gulp');
const imagemin = require('gulp-imagemin');

exports.default = () => (
    gulp.src('src/images/*')
        .pipe(imagemin())
        .pipe(gulp.dest('dist/images'))
);

Custom plug-in options

// …
.pipe(imagemin([
    imagemin.gifsicle({interlaced: true}),
    imagemin.jpegtran({progressive: true}),
    imagemin.optipng({optimizationLevel: 5}),
    imagemin.svgo({
        plugins: [
            {removeViewBox: true},
            {cleanupIDs: false}
        ]
    })
]))
// …

Please note that you may encounter older implicit syntax. In versions earlier than version 3, as follows:

// …
.pipe(imagemin({
    interlaced: true,
    progressive: true,
    optimizationLevel: 5,
    svgoPlugins: [
        {
            removeViewBox: true
        }
    ]
}))
// …

Custom plug-in options and custom gulp-imagemin options

// …
.pipe(imagemin([
    imagemin.svgo({
        plugins: [
            {
                removeViewBox: true
            }
        ]
    })
], {
    verbose: true
}))
// …

Compression only modify the picture. Time-consuming when compressed images, in many cases, we only modify some of the pictures, there is no need to compress all the pictures, use the " gulp-cache" compression only modify the picture, the picture does not modify read directly from the cache file

var gulp = require('gulp'),
    imagemin = require('gulp-imagemin'),
    pngquant = require('imagemin-pngquant'),
    //确保本地已安装gulp-cache [cnpm install gulp-cache --save-dev]
    cache = require('gulp-cache');
    
gulp.task('testImagemin', function () {
    gulp.src('src/img/*.{png,jpg,gif,ico}')
        .pipe(cache(imagemin({
            progressive: true,
            svgoPlugins: [{removeViewBox: false}],
            use: [pngquant()]
        })))
        .pipe(gulp.dest('dist/img'));
});
 

API:
with the following non-destructive Optimizer:

• [gifsicle](https://github.com/imagemin/imagemin-gifsicle) - Compression GIF images
• [jpegtran](https://github.com/imagemin/imagemin-jpegtran) - JPEG image compression
• [optipng](https://github.com/imagemin/imagemin-optipng) - Compression PNG image
• [svgo](https://github.com/imagemin/imagemin-svgo) - compressed SVG image

** imagemin(plugins?, options?) **

• plugins(Plugin)
  Type: Array
  Default: [imagemin.gifsicle(), imagemin.jpegtran(), imagemin.optipng(), imagemin.svgo()]
  to use plug-ins . This will override the default plug-ins. Note that the default plug-in has a good default value, and in most cases should be sufficient. Refer to the individual plug-ins for the supported options.
• options(Option)
  Type:object

{
            optimizationLevel: 5, //类型：Number  默认：3  取值范围：0-7（优化等级）
            progressive: true, //类型：Boolean 默认：false 无损压缩jpg图片
            interlaced: true, //类型：Boolean 默认：false 隔行扫描gif进行渲染
            multipass: true //类型：Boolean 默认：false 多次优化svg直到完全优化
}

• verbose(Long)
  type: boolean
  Default: false
  this feature is enabled on each of the information recorded in the image transmitted to gulp-imagemin:

gulp-imagemin: ✔ image1.png (already optimized)
gulp-imagemin: ✔ image2.png (saved 91 B - 0.4%)

• silent(Silent)
  Type: boolean
  Default: false
  Do not record the number of images have been reduced.
  --silentIf this option is not specified, you can use the command line flag to enable it.