This tutorial is aimed squarely at the novice GIMP user. The more experienced user may find some techniques here useful. We'll point out the differences as I go along. We've taken a lot of screen shots to support this tutorial, so enjoy :)

submitted: 5 years and 3823 days ago

First of all you have to acquire through a scanner or something similar your sketch. It doesn't necessitate to be truly a black and white image (2 colors), often a well contrasted grayscale image is better (use contrast autosketch or/and the brightness-contrast tools).

submitted: 5 years and 3823 days ago

Many times you have an image with a colored background, like the one above and you want to take out the background to use the image's subject in a composition. With gimp there are many ways to achieve this.

submitted: 5 years and 3823 days ago

This tutorial shows you how you can efficiently replace the background of an image with another in GIMP, through the use of the color to alpha plug-in. The aim is to show the advantages of using the color to alpha plug-in over selection-based techniques. To illustrate this, this tutorial will use the above images as source and destination. This tutorial doesn't address the complexities of handling real-world photos in this manner, but does briefly discuss it at the end.

submitted: 5 years and 3823 days ago

Real-world images have lots of noise: film grain, scanner lines, CCD noise, paper texture, and just about anything else you can imagine. Computer-generated images, on the other hand, tend to be too real. If you need to make computer-generated images look like real-world ones, then this tutorial is for you.

submitted: 5 years and 3823 days ago

The threshold plug-in works by dividing the image into two parts, dark and light, producing a 2 color image. This is often not the desired result, for some images anti-aliasing is needed, but the threshold plug-in cannot provide that. With a little utilization of the curves plug-in, we get nice results.

submitted: 5 years and 3823 days ago

The Path Tool (replacing the old Bezier Selection tool) can be used in many creative ways. Maybe the best thing in it is the smooth, beautiful curves it produces. But you can also use paths to create different polygonal shapes if you don't 'pull out the handles'. Polygonal shapes are especially useful when painting some geometric objects, as you can draw one side at a time (into different layers if you want).

submitted: 5 years and 3823 days ago

This tutorial shows you how you can do straight lines with GIMP, using a feature called the Shift Key. Straight lines are a convenient way to make things that aren't so terribly affected by the imprecision of a mouse or tablet, and to take advantage of the power of a computer to make things look neat and orderly. This tutorial doesn't use Straight Lines for complex tasks; its intended to show how you can use it to create quick and easy line effects.

submitted: 5 years and 3823 days ago

It used to be that the photos with red eye weren't really worth fixing as only cheesy cameras had the flash built in and underneath the red eyes was a crappy photo. Well, welcome to the future when you can get a pretty good image from a camera with the flash built in. They do not have a button that works to prevent this yet, so don't even try it. The best way to fix red eye on photos is to have those intense people look at the photographers shoulder. The cause of red eye is the flash reflecting from the back of the eye and into the lens. So, until this lovely child is able to understand "look at my shoulder" it is good to know that red eye can be fixed, somewhat.

submitted: 5 years and 3823 days ago

This tutorial shows how you can do vignette effects using a feature of GIMP called QuickMask. QuickMask is a convenient way to modify selections using pixel-changing tools such as the paintbrush, eraser, or any plug-in filter. It lets you make very precise adjustments to your selections. This tutorial doesn't use QuickMask for complex masking; it's intended to show how you can use it to create quick and easy vignette effects.

submitted: 5 years and 3823 days ago