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Q&A

How to decrease image size from commandline

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Problem

I'd like to be able to decrease images, particularly jpg and png's, either to a percentage of the original file, or a specified size in bytes.

MWE

decrease --size=900KB -o image_small.png image.png
decrease --size=90% -o image_small.png image.png

Notes

It can be two separate tools, but I want them to support both options, and ideally, follow proper Unix option dash conventions (--out=file, -o file).

For jpg, I found jpegoptim which allows me to specify a size in either kilobytes or percentage:

jpegoptim --size=900 --dest=compressed image.jpg
jpegoptim --size=90% --dest=compressed image.jpg

One downside of this though is it does not have a -o option to create a new file; it either overwrites the input file, or takes in an output directory that must exist ahead of time.

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1 comment thread

What does "size" mean in this context? (2 comments)

1 answer

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Here goes nothing. An Internet search shows an answer on AskUbuntu#1164, author aneesheep.

The gist is to install ImageMagick (try package name imagemagick) and then use the convert utility:

convert -resize 20% image_small.png image.png

You can write a wrapper script that subscribes to your preferred options.

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1 comment thread

This is not a bad idea to do a wrapper that converts `--size` to percent, but `convert does not use p... (1 comment)

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