Make a Thumbnail Image in 3 Minutes
Shrink a larger picture down to a thumbnail or icon size.
Perspective Clone Tool will allow you to clone part of an image into the foreground or background. It does this by scaling the area at the same time that you are cloning it.
The Crop tool allows you to Cut off the unwanted edges of your pictures. After that, see how to resize your image bigger or smaller with image scaling.
An introduction on using the Gimp tools main window.
A short video on resizing and moving images.
Press Ctrl+i to import an image. To keep an images aspect ratio, it has to be encapsulated with a Zoom layer.
Shrink the file size of a jpeg picture by lowering it's image quality some.
Create music album and poster type artistic patterns.
Create fancy patterns as seen on currency or stamps.
Scroll down to the section "Change the Size of an Image (Scale)" on this webpage:
<Image> Image > Scale Image
Scroll down to the section "Make jpegs Smaller" on this webpage:
<Image> File > Save As