Gimp Expert
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Image Pipes
GIMP 1.2 introduced a lot of new features that have been further improved in version 2.0, including the ability to use full color "pixmap brushes". In addition, you can also combine single frame pixmap brushes into a "image pipe". A GIMP Image Pipe allows you to spray out series of full color pixmaps. To make it more flexible, the order the images are painted onto the canvas can depend on direction, angle, speed, or other factors.
A pixmap brush is an image, with both shape and color, that gets drawn with one of the paint tools. The pencil draws the pixmap with a single click. The paintbrush does the same with some extra options. The airbrush allows you to do levels of transparency for the pixmap brush. Even the eraser can be made to erase segments in the shape of the pixmap.
Image Pipes 2
Doesn't the title look really valuable? To reproduce this effect you need the incredible "Lighting"-Plugin, created by Tom Bech and Federico Mena Quintero. It is not in the standard gimp-1.0 distribution, you have to install it yourself.
Golden Text Tutorial
High pass filtering means that we filter away the low frequencies of something, and let the high frequency bands pass. In image terms, this means that the detail of an image is kept, while the larger scale gradients are removed. Luckily, it's not as complicated as it sounds.
Sketch Effect
Straightforward Sobel edge detect ( Filters -> Edge-Detect -> Sobel ) of original (don't forget to save a copy of the original) The Sobel edge detect should be done on the background image (without an alpha channel) rather than a copy of the background (which has an alpha channel). Bring out detail with an auto-equalise ( Layer -> Colors -> Auto -> Auto-Equalize ) of the sobel edge detect, and convert it to greys using desaturate ( Layer -> Colors -> Desaturate ). We only want the strong edges, otherwise it'll look crap. To get them, we eliminate the edges with small magnitude. The easiest way to do this is with the curves tool ( Image -> Colors -> Curves ) like this. We set the curve type to free (which allows discontinuities), and then for the bottom 3/4 of the curve (or thereabouts) to 0.
Photo to sketch
So, we want to create a nice paintbrush image with GIMP. This tutorial can be a bit complex and I think it is better for a bit more advanced GIMPer. If you want to learn the basics, a good way to do so is to get one of the many GIMP books written. If I must pick one to recommend, I think it would be Grokking The Gimp , it is pretty good. But I am sure many of the others are great too, check a few out at your bookstore! Use the Bezier (Paths) tool to make a brush-shaped selection, like on the above image.
Draw A Paint Brush
Almost every desktop enviroment I've seen has a special application for creating icons, usually a very limited drawing application. In this short tutorial, we'll show you how GIMP (GNU Image Manipulation Program) can help you create icons for your desktop. GIMP enables you to save compressed files and work with them transparently, using the .xcf format. However, since we're working with very small files, compression simply doesn't save enough space to justify the effort. Especially since filemanagers like Nautilus have problems with creating thumbnails for compressed images, it's best to accompany any .xcf files you produce with a .png version.
Creating Icons
GAP is an advanced tool to be able to create animations, this guide should give you some sort of view of how GAP works and what you can do with it. For a good tutorial of how to make an animation with GAP then take a look at the " Advanced Animation " tutorial. Source Image/Layer specifies, which layer you want to animate on top of the current image. If you select a layer from a multilayer image, make sure you don't forget to specify the stepmode as well.
Using GAP
Welcome to the advanced GIMP animation tutorial. Here you'll learn how to use the GAP, GIMP animation package. It is very advanced, but the user interface might be confusing for some at first.
