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Title: Software/Graphics/Image Editing/The GIMP/FAQs, Help, and Tutorials - Creating Animated Brushes (Image Hose) 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 campus can depend on direction, angle, speed, or other facto
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Creating Gimp Image Pipes

Gimp Image Pipes

Gimp 1.1 and the soon to come 1.2 introduce alot of new features, includingthe ability to use full color "pixmap brushes". In addition, you can alsocombine single frame pixmap brushes into a "image pipe". A Gimp ImagePipe allows you to spray out series of full color pixmaps. To make itmore flexible, the order the images are painted onto the campus candepend on direction, angle, speed, or other factors.This effect can be used in many ways, from a simple way to paintrepeated images, or as sophisticated texture generation.The flexibilty in the way images are sequenced and compositedto the canvas on the image can make creating a imae pipe todo what you want seem difficult. However, for almost all commonimage pipes it is easy to set them up.

Example 1

Taking a set of images and making a image pipe out ofthem is a common configuration. The easiest way to do this is to create each indivualimage as a separate layer in an image, much like you would ifyou were going to save an animated image. And in fact thisis often a convient way to think of image pipe creation. Asdesigning an animation of which snapshots are going to becomposited to the canvas. Lets start with a simple example image, an 8 layer image. Inthis case, with the numbers 1-8 on each layer. This will helpto make it more obvious what the various "ranks" do. There isnt currently a loader for gih (the gimp imagepipe, so I include the source xcf images here. The example image.To start creating a image pipe, you will need to savethe file in the ".gih" extension. To use the brush immediately,you probabaly want to save it in the brushes/ subdir of yourgimp directory (probabaly ~/.gimp-1.1).To save the image you will be presented with a save dialogfor the GIH plugin. For a simple image like this, the only values you usuallyneed to change are "Spacing", The "Number of Cells",the number of "Ranks", and the "selection" for eachrank. Spacing is pretty much the same as for regularbrushes. It indicate what percentage of a brush widthor height that the cursor moves between each time the shape is pasted.Ranks indicates how many levels of variationto use by the Selection values. For this image,the value of ranks should be equal to the number ofimages in the stack. Since it is possible to havemulti-dimensional pipes, there needs to be a way toset more than one rank.For this example, we are going to choose to selectfrom the rank using method "incremental". This essentialmeans that the images will be selected in the order theyare in the layer stack. Other options include: Random: selects the images in a random order. Angular: selects the images based on the angle the brush is moving at. Velocity: selects the images based on the velocity thebrush is moving at.Pressure: selects the images based on the pressureof the brush (requires a pressure sensitive tablet)xtilt: selects the images based on the xtilt (alsorequires a tablet)ytilt: selects the images based on the ytilt(also requires a tablet)After saving the image, you can "refresh" the brushlist and then select the new image. For an exampleof what this can do, tale a look at this example image(also making use of the fun gradient brushes).

Example 2

Tater Tots!This pipeis a good example of making a image pipe outof a series of images. Each layer has a a bit of an image cut outand placed on a transparent background. Anyareas that are transparent in the imagewill be transparent in the brush as well.To add a bit more of a "3D" effect, a slightdrop shadow was adding to each layer in the image. Save this image as gih with the parameters asindicated in the following screenshot.An example of the use of this image:

Example 3

An example of a two dimensional pipeA interesting use for image pipe would beto simulate a natural media situration. Forexample, maybe a brush that has ten differentversions based that correlate to tabletpressure. For this example, I'll use a somewhat contrivedexample for simplicity sake. It will use the"angular" paramater in for per layer dimension,and a "random" paramter to select which of themultiple images to use. I use this in a coupleof brushes to "humanize" the output. Insteadof having the same image stamped out overand over, it varies a little randomly. The example sourceimage is a 8 layer image, with each layersplit in two with a guide. The guide isnt requirebut it makes it easier to create.A screenshot of the layers dialog showing creation of an image of this type. You will want to save the image with the valuesshow here:

Example 4

Using a image pipe as a way to generatetextures.Making tileable textures with gradient brushesis a tutorial on how to generate textures withjust graident brushes. A lot of the same techniques that are used therecan be used Image Pipes as well. The main advantage to using image pipes is that thebrush as well as the color can change as youpaint, which adds an extra dimension to thetextures. For this example, it is just another onebrush per layer situation. The examplesource imageis available.The image is saved with the paramaters asin:Example output:

Example 5

Converting a PSP image tube to a gimp Image Pipe There are lots of "Image Tubes" created with and for Paint Shop Pro available on the internet. Gimp can load these files and save them as gimp image pipes. Unfortunately, unless you really like pictures of teddy bears, puppy dogs, and unicorns, finding good PSP Tubes isnt so easy. There is a .tub loader plugin in gimp thatyou can use to load .tub files you find onthe net. Then you can turn around and save thesefiles as a .gih file. Were going to start with a .tubfile available from Hood's PSP Tubes I'll use the Fireball example on that pagefor this example. The file needs to be loaded as a regular image,then saved as a gih image. Sometimes you may need tomake some best guesses as to the save parameters. An example of what the image window will looklike after initially loading the .tub file. Saving this file as a .gih file, and usingthe paramaters as shown in Adrian Likins adrian@gimp.org
 

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

campus

can

depend

on

direction,

angle,

speed,

or

other

facto

http://adrian.gimp.org/gimppipe/

Creating Animated Brushes (Image Hose) 2008 October

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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 campus can depend on direction, angle, speed, or other facto

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