The Gimp

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About the class

Oso Says "Take the Gimp Class!

The Gimp is the image editing software distributed on FreekBoxes - and used by all kinds of people to make cool pictures. This is an introductory-level class, and should be accessable to anyone who has mastered the material taught in the FreekBox Adoption Class.

Related Links

From the project's web site,

Class 1: Starting and Selections

right-click to download today's suggested image


Something fun - change the color of the background.

  1. use the elliptical select tool to select the earth in today's suggested image
  2. float the selection
  3. convert the selection to a new layer
  4. change the foreground color (click on the black box in the tool palette)
  5. add a new layer with a colored background (shift - new layer)
  6. move the layers so the colored layer is underneath the earth

Class 2: Color select and Magic wand

Right-click to download today's suggested image

  1. open today's suggested image
  2. open the rocket or jellyfish
  3. use the layer palette to add an alpha channel how to do it
  4. Remove the background of the rocket or jellyfish by clicking on the background with the magic wand or color selection tool. (hint - the rocket is easier)
  5. drag the layer (from the rocket or jellyfish layer panel) into the space cloud image

Class 3: Edges, tools, fills, paths

Right click to download today's suggested image

Something fun - isolate Rosie from the background

  1. Use the edge select tool, save to path and quickmask to create a selection around Rosie
  2. duplicate the background
  3. Select and float Rosie to a new layer. Turn off her visibility
  4. use the motion filter on the duplicated background
  5. Turn the "floated" version of Rosie back on.

Class 5: paths

Right click to download this sample image

Class 6: Common tasks

Class 7: Fixing Images

A crappy photo taken with a cell phone. Right click to save this to your desktop
  * Use the Black Eyedropper to pick a black point.
  * Use the White Eyedropper to pick a white point.
  * Adjust mid-tones using the slider.
  * Color cast can be adjusted using the channels and eyedroppers
A less-than-stellar photo. Right click to save this to your desktop
The same photo after adjusting color and sharpening
If we wind up talking about color correction, you're going to need a color wheel

Class 8: Retouching and layer masks

Most images in magazines are highly deceptive. Take a look at some of these examples:

Class 9: animations

An example of GIMP animations

Today's image (warning, 4 megabytes) contains XCF files for use with GIMP

  • Animations

Tutorial on Gimp Animation

class 10: Channels

Frequently asked "How do I ... "