How to Change Backgrounds Using Chromakey and Gimp


Digital cameras and photo-editing applications have revolutionized not only the way people take pictures, but how they use them. Not only can you easily crop photos or repair flaws, you can use the tools to alter them. For example, if you would like to create an image in which you place yourself against a background scene you have never actually visited, you can use Chroma Key in the freeware application GIMP to do it.

  • Take a photo of yourself standing against a blue or green background, such as a painted wall or sheet. You should not be wearing anything that has the same color as the background. Load this photo onto your computer.

  • Start the GIMP application. Select "File" from the menu and choose "Open." Locate and open the photo you loaded.

  • Select "Layer" from the menu and click "Transparency." From the options, choose "Add Alpha Channel."

  • Go to the toolbar and choose "Select by Color." Click on the background in the image and click "Delete."

  • Select "File" from the menu and choose "Save As." Name the file and click "Save."

  • Open an image in GIMP you want to place yourself against. Then select "File" from the menu and choose "Open as Layers." In the dialog, browse to and open the image you saved in Step 5. Use the "Move" and "Scale" tools to position yourself against the background. Save your work.


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