The basic editor Tumblr provides for posting, however, does not include a way to change the alignment of text or images, so to center an image you have to edit the post's HTML code manually.

How to Center the Text in GIMP. GIMP is a free, open-source image manipulation software program that is similar in nature to Photoshop. You can create images and text in GIMP, and there is a ...

The challenge of describing every image on the internet, and the people who are trying.