carol.gimp.org

<Image> View -> Info Window initiates a window with the information.

Much of this information appears in other places; the Info Window simply presents it all in one tidy area. New users of TheGIMP can safely ignore "Print Size" and "Resolution"; this embedded information in each image seems to be ignored by every printer or image display; so you can also.

Perhaps you have a task similar to the task demonstrated in the Crop Quickie where you need to make an image square, only this task demands that you retain as much of the original information as possible. This is so easy to accomplish by simply determining the smaller of the two pixel dimensions and using this number in the Width and Height area of the crop dialog (in this case, 1548 pixels would be the largest square area that can be made out of this image.

The more you play with computer graphics, the more uses you will have for this information.