Man jpegoptim Installing and using OptiPNG Once this is completed, you should be able to see all the compressed images in the directory “compressed_images ”.įor additional information about jpegoptim, visit the man pages by running :
Now you should be able to execute the script as follows: As mentioned above, make sure to have the destination folder named compressed_images created already. To run the script, you would need to change to the directory where your images are available. To it executable by the current user, execute the command below: compressed_images -p “$i” doneĪfter you are done with the script, exit and save. #!/bin/sh for i in *.jpg do jpegoptim -d. Once it is in edit mode, add the following codeline : To create the script, run the command below which will open an empty script file named compressmyjpg.sh : This shell script will be able to compress all jpg images in the current directory and store them in a folder with the name “compressed_images”. To compress many images at once, it is also possible to use a script. To compress multiple images, run the command as follows: To compress many images in a directory, change to that directory and run the command below in order to compress all the images at once: Read: Best Free Graphic Design software for Linux Compressing images in batch Notice the original file size has not been changed. The expected reduction will be around 15.45% as shown in the simulation command above. The following command will provide an estimate about the expected size after compression : Jpegoptim -m your_original_image.jpg Image pre-compression simulationīefore compressing an image, you have the possibility to simulate image compression so that you get an idea about what to expect. To specify the compression percentage, run the command as follows : This option will disable lossless optimization mode and will thus lower the original quality. Jpegoptim –size=500k /home/net2_admin/lion.jpeg This however will disable the lossless optimization and will therefore result in quality loss as expected.įor instance, let’s compress the image above from 1.7MB to around 500KB.This can be done by using the command : Using this utility, you would also be able to compress the original image to a desired size. Read: How to use the Tar command in Linux to compress and extract files a. There are actually two options to “lossily” compress your images : If you do not care about the quality after compression, you can specify how much loss in quality suits you. This will compress new_file_name.jpg file and save it to the older net2_images_folder. To prevent replacing the original image when you run the command above, you can save the compressed image to another directory as follows. If you think you can optimize further the compressed image, you can re-run the command above but this will not make any difference as you can see below : Read: 4 Benefits of Compressing Files and Folders Using Tar Backup in Linux OS Normally the original and compressed images should have the same quality.
Now try to open the compressed image to see if there are quality differences. Since this overwrites the original file, make sure to perform a backup before launching the command above. This has resulted in optimizing the original image by 15.45%. If we now run the command below to compress the image lion.jpg : Read: How to find the largest files on Linux However before doing so let us first find out the size using the du command:Īs you can see, the actual size of the jpg image above is 1.7M. To compress an image using Jpegoptim without losing the original quality, the syntax is as follows :įor instance the command below will optimize our example file (lion.jpg). Jpeg compressor Jpegoptim installation Compressing images using Jpegoptim Now to install jpegoptim, run the command below : Since Jpegoptim is available on the official Ubuntu repository, it can be installed using the apt-get package manager tool.īefore starting the installation however, it would be best to update your system’s repository list so that you get the latest available of the application. Lossless optimization is supported as well. Jpegoptim is a command line utility that help compress and optimize jpg, jpegs as well as jfif files without losing the original quality.
In this article we will use two command-line based utilities, jpegoptim and OptiPNG. There are many GUI applications on Linux that help optimize and compress images while retaining the original quality.
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