Converting Image File Formats with Command Line & sips

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Converting images to new file formats is very easy thanks to a variety of tools built right into OS X (and most Linux distributions). While the simplest method uses Preview for converting images, there is a command line option that uses the same sips tool we discussed earlier to run the batch format from the command line. Sips allow you to convert individual images to new image formats or even perform batch image conversions.

Easy image conversion from the command line

Use the following command string syntax to convert a single sip image:

sips -s format -from

For example, for a file named “test.jpg” that you want to convert to PNG, the sips syntax would be:

sips -s format png test.jpg –out test.png

Batch Image Conversion with sips

Converting a group of images is a bit trickier, and using simple wildcards, like resizing with sips, doesn’t work quite the same. You’ll notice that using a generic wildcard like * doesn’t rename the file either, so we’ll use very basic shell scripting instead with the following command syntax:

before I in ; do sips -s format $ i –out / $ i.;done

Using that, we will convert a folder of .jpeg files to png files in a new subfolder of the current folder, called “Converted”:

for i in * .jpeg; do sips -s format png $ i –out converted / $ i.png; ready

Running that command may result in all JPEG images being converted to PNG format in the new folder.

A potentially annoying catch is that the resulting filenames also include the original file type, meaning you end up with files named “test.jpeg.png”. The file extension remains correct, it is just a naming problem. You could get around that by renaming them to start with and then adding the correct file extension with a similar bash script, using regex, or renaming them manually with mv.

When running sips with some file formats you may encounter ‘lingpng warning’ errors related to exif data, those errors can be largely ignored and image conversion will still take place.

Thanks to Thom for the batch conversion idea

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Converting Image File Formats with the Command Line & sips: FAQ

Tutorial Summary: Converting Image File Formats with the Command Line & sips

In this guide, we told you about Converting Image File Formats with the Command Line & sips; please read all steps so that you understand Converting Image File Formats with the Command Line & sips in case if you need any assistance from us, then contact us.

How this tutorial helping you?

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What is actual time in which this method complete?

The time to complete the Converting Image File Formats with the Command Line & sips tutorial is 10+ minutes.

What are the supported Device?

Apple

What are the supported Operating system?

mac OS


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