node.js - 利用gulp-imagemin压缩jpg格式图片变化不大

Question

使用gulp-imagemin压缩图片，对于png图，压缩前后变化还是挺明显的，但是压缩jpg图片变化很小，gulpfile的设置如下：

const gulp = require('gulp');
const imagemin = require('gulp-imagemin');
const imageminPngquant = require('imagemin-pngquant');
const imageminJpegtran = require('imagemin-jpegtran');
 
gulp.task('default', () =>
    gulp.src('src/images/*')
        .pipe(imagemin({
            use:[imageminPngquant(),imageminJpegtran()]
        }))
        .pipe(gulp.dest('dist/images'))
);

如何让压缩的jpg也像png图一样压缩前后大小变化比较明显？

Answer 1

gulp.task('imgmin', function () {
    var jpgmin = imageminJpegRecompress({
            accurate: true,//高精度模式
            quality: "high",//图像质量:low, medium, high and veryhigh;
            method: "smallfry",//网格优化:mpe, ssim, ms-ssim and smallfry;
            min: 70,//最低质量
            loops: 0,//循环尝试次数, 默认为6;
            progressive: false,//基线优化
            subsample: "default"//子采样:default, disable;
        }),
        pngmin = imageminOptipng({
            optimizationLevel: 4
        });
    gulp.src("src/img/*.*")
        .pipe(imagemin({
            use: [jpgmin, pngmin]
        }))
        .pipe(gulp.dest("dist/img"));
});

Answer 2

Have you solved the problem? I feel that the compression speed is very slow. Is there any way to speed up the compression?