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So you installed GIMP on your computer, congratulations! GIMP is a very powerful image manipulation software, but don’t let that intimidate you. Even if you don’t have time to learn advanced computer graphics, GIMP can still be a very useful and handy tool for quick image modifications.
It is my hope that these few examples will help to solve those small, quick modifications that you may need to apply to an image. Hopefully this will lead to learning even more powerful image editing capabilities that GIMP is capable of as well.
For quick access, these are the four main points I’ll cover in this quick tutorial:
Changing the Size (Dimensions) of an Image (Scale)
Changing the Size (Filesize) of a JPEG
Crop an Image
Rotate or Flip an Image
In keeping with the spirit of the predecessor to this page, I will be using images from the Astronomy Picture of the Day (APOD), provided by NASA.
All you need to know how to do to follow these quick examples is to be able to find your image and open it:
File → Open
Changing the Size (Dimensions) of an Image (Scale)
It’s a common problem that you may have an image that is too large for a particular purpose (embedding in a webpage, posting somewhere online, or including in an email for instance). In this case you will often want to scale the image down to a smaller size more suitable for your use.
This is a very simple task to accomplish in GIMP easily.
The image we’ll be using to illustrate this with is The Horsehead Nebula in Infrared.
When you first open your image in GIMP, chances are that the image will be zoomed so that the entire image fits in your canvas. The thing to notice for this example is that by default the window decoration at the top of GIMP will show you some information about the image.