User Guide

GNU Image Manipulation Program
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Figure 6.8: The Wilber Image Opened in RGBA Mode.
2. To save an image with alpha transparency, you must have an alpha channel. To check if the image has an alpha channel,
go to the channel dialog and verify that an entry for ‘Alpha’ exists, besides Red, Green and Blue. If this is not the case,
add a new alpha channel from the layers menu.
3. You can now remove the background layer to get a completely transparent background, or create a gradient from color to
transparency. You are only limited by your imagination. To demonstrate the cabilities of alpha transparency, we’ll make a
soft glow in the background around our Wilber.
4. After you’re done with your image, you can save it in PNG format.
Figure 6.9: Mid-Tone Checks in the background layer represent the transparent region of the saved image while you are working
on it in GIMP.