The more often we need to a certain task, the more direct access we want to have to it. We don’t want to click through 10 sub-menus to create a new folder (that’s why it is right in the context menu of nautilus). When web searches became more and more frequent, browser developers invented the search bar next to the address bar and with the usage of the address bar continuing to decrease the two have been merged in recent versions of most browsers.
I my opinion this „usage frequency/accessibility“ ratio is far too high in common linux distributions (and all windows installations I have worked with for that matter), when it comes to resizing an image. Say you want to share some of your vacation photos with your friends, firing up GIMP and resizing them all manually seems like the worst case, but it really does not get much better in a standard GNOME environment. (This is just from personal experience, if I’m wrong please leave a comment).
A quick terminal command that I have used for a long time is described here. It uses the convert tool from the ImageMagicK package (which is much more powerful than just a simple resizer). To resize an image you just need to run
convert image.jpg -resize 50%
To reduce to size of the image to 50%. You can also convert multiple images at a time, for more details on this click here! I any case, you still have to open a terminal, cd to the right folder and enter the command. As a user who generally uses a GUI (namely nautilus, GNOMEs default file browser) to browse files, this is still too much work.
I have finally found what I was looking for in nautilus-image-manipulator. (formerly nautilus-image-converter). It is a neat little nautilus extension written in python that plugs itself right into the context menu (i.e. the right click menu) in nautilus. Whenever you right click on an image file there is an entry „Resize image“ giving you this:
The rest is self explanatory, you can choose the exact size, or just give a percentage. Also you can replace the originals or store resized copies. The best thing is, that it works flawlessly with multiple images at the same time.
Arch users can build and install nautilus-image-manipulator from AUR. It has a couple of python specific dependencies, all of which are available through AUR or the pacman repositories.