Image Compression tools via command line [closed]

问题

I'm searching best tool to compress images (png and jpeg) via command line.
After googling I found trimage which is good as it compresses both png and jepeg, but compression ratio is very poor in this case.

I came across jpeg-optimizer.com online tool which does the job way better than trimage. Can any one help to find the right tool for this.

回答1:

I'm using the following tools to perform lossless image compression:

pngcrush
gifsicle
jpegtran

For each of the programs, I've created two shortcuts:

One that does the actual compression, and shows the file size of both files
One that replaces the original file with the compressed one (If I'm satisfied, I'll do arrow-up, prefix my previous command with a "m", and press enter).

I've put this in my .bashrc:

# Image optimization tools
png() {
    pngcrush -brute "$1"{,.} && du -b "$1"{,.}
}
gif() {
    gifsicle -O "$1" -o "$1." && du -b "$1"{,.}
}
jpeg() {
    jpegtran "$1" > "$1." && du -b "$1"{,.}
}
# Just for easy access in history
mpng() {
    mv "$1"{.,}
}
mgif() {
    newsize=$(wc -c <"$1.")
    oldsize=$(wc -c <"$1")
    if [ $oldsize -gt $newsize ] ; then
        mv "$1"{.,}
    else
        rm "$1."
    fi  
}
mjpeg() {
    mv "$1"{.,}
}

Note: pngcrush -brute is very verbose. Redirect the output to /dev/null if you're not interested in the progress.

回答2:

Lossy PNG: pngquant2
Lossless PNG: AdvPNG (good and fast) or ZopfliPNG (slow, but best)
Lossless JPG: mozjpeg's jpegtran or jpegrescan
Lossy JPG: mozjpeg's cjpeg (try online) or imgmin
If you're running macOS: ImageOptim CLI

回答3:

If you are on Linux, try mogrify tool from the imagemagick suite

It is quite handy on command line.

Ex :

mogrify -resize 50% rose.jpg

mogrify -format jpg *.png

来源：https://stackoverflow.com/questions/19153122/image-compression-tools-via-command-line

标签

optimization

image-processing

image-compression