- Launch GIMP and open the object photo by going to File -> Open.
- Open the photo of someone you want to put her/his face on an object by going to File -> Open.
- From two steps above, you will have two tabs on GIMP. Switch to the tab containing someone photo and go to Layer -> Transparency -> Add Alpha Channel.
- Add a layer mask by going to Layer -> Mask -> Add Layer Mask. On the appearing pop-up, select the White (full opacity).
- Make sure the foreground color is black.
- Use Paintbrush Tool to remove all areas on someone photo but the face area. Remember, you want to put someone's face so you need to retain the face.
- Once you are done with the removing process, go to Layer -> Mask -> Apply Layer Mask.
- Click the Rectangle Select Tool on the Toolbox panel and select the face area.
- Go to Edit -> Copy.
- Now switch to the object tab and go to Edit -> Paste as -> New Layer.
- Use the Move Tool to set the position of the face photo and use the Scale Tool to scale it.
- Select the Clipboard layer and set its mode to Grain merge.
- Duplicate the Clipboard layer by going to Layer -> Duplicate Layer and set the mode of the new duplicated layer to Multiply.
- Duplicate the new layer you have duplicated above and set its mode to Normal.
- Select the top layer and go to Layer -> Mask -> Add Layer Mask. On the appearing pop-up dialog, select Black (full transparency).
- Change the foreground color to white.
- Use the Paintbrush Tool to brush the eyes as well as teeth area. Zoom-in to get a better result. You can use the Eraser Tool to recover the parts you have brushed.
- Select the original Clipboard layer and go to Layer -> Mask -> Add Layer Mask. On the appearing pop-up dialog select White (full opacity).
- Once again, brush the face area using the Paintbrush Tool. This time, use a smoother brush type. In this example I use Hardness 025.
- Restore the foreground to black.
- With Paintbrush Tool selected, brush the face area to get a smoother blending.
Done! Following is the example result of this tutorial.
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