This is a very simply question, but one that I have been struggling to find an answer to: How can I put a box outline around something in GIMP? So that you can easily circle (but with a rectangle or square and not a circle) something in an image that you want to point out to someone. Or is there a better tool which would easily allow it without lots of manual drawing if it cannot easily be done in GIMP? When on Windows I would use Paint for this as I could not find an option in GIMP, but now in Ubuntu I can't find anything else to do it in.
Ubuntu – How to put a box around something in GIMP
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Related Solutions
Warning: broken. Shutter is severely broken in Ubuntu 18.04 and not available in later versions.
Shutter (which you can install from the Ubuntu Software Centre or sudo apt-get install shutter) is a tool which has a variety of options for taking and annotating screenshots. (Note: You can annotate any images of your choice, not just screenshots.)
Using the tools provided with ImageMagick
We can easily join, i.e. "montage" images into one large image with the following command
montage -geometry 500 image1 image2 [...] output
See the project page for many parameters of the geometry option. In the example above all images will be scaled to a width of 500 pixels before they are joined. Adapt this value for your image sizes. In case you need to have a fixed height choose x500 instead. The other dimension will be scaled to preserve the aspect ratio.
Inspired by this post saying that ImageMagick has command line tool named convert to merge images. To join images horizontally (in alphabetical order):
convert +append *.png out.png
To stack images vertically:
convert -append *.png out.png
That should be run in a terminal into the folder containing png files to join them all.
A gui for that would be:
a file manager context menu to join selected images.
An easy way when it comes to that is Thunar's custom actions:
To join selected images vertically (into one png file, in alphabetical order, no matter their extension) add this custom action:
convert -append %F joined-vertical.png
To join horizontally:
convert +append %F joined-horizontal.png
For a more sophisticated way to assemble images you may want to search for panorama photo stitcher software such as hugin
or the Pandora plugin for Gimp.
Best Answer
Select the area you would like to outline with the rectangle select tool, go to Edit > Stroke Selection. You will get a dialogue. Choosing Solid Line will create an outline using the currently selected foreground color. Choosing With a Paint Tool will give you more creativity.