More Gimp Documentation
Why would you want to work with such a crude tool? Perhaps the most important usage is when working with very small images, such as icons, where you operate at a high zoom level and need to get every pixel exactly right. With the pencil tool, you can be confident that every pixel within the brush outline will be changed in exactly the way you expect.
Information on the Pencil Tool is almost non-existing or just not very good so this was a short tutorial as expected!
What a very nice tool!! I discovered that you can change colors (that's probably a DUH!) But it is very nice to outline an existing photo and get a very nice affect. Doesn't have to be just Pencil Color.
Tip1:
If you want to draw straight lines with the Pencil (or any of several other paint tools), click at the starting point, then hold down Shift and click at the ending point.
Tip2: This will be handy for cleaning up those stray pixels that seem to hang around after erasing a colored background to make it transparent:
"Perhaps the most important usage is when working with very small images, such as icons, where you operate at a high zoom level and need to get every pixel exactly right. With the pencil tool, you can be confident that every pixel within the brush outline will be changed in exactly the way you expect".