The brightness and contrast of a layer’s alpha channel can be adjusted to tweak the edges of a composite.
- Brightness: Adjust to the left to decrease brightness, or to the right to increase brightness of the alpha channel. Remember that in the alpha channel, black is completely transparent, and white is completely opaque, so the visible results in the viewer alter what parts of the layer are visible, rather than the actual tonal values of the image.
- Contrast: Adjust to the left to decrease contrast, or to the right to increase contrast of he alpha channel. Remember that in the alpha channel, black is completely transparent, and white is completely opaque, so the visible results in the viewer alter what parts of the layer are visible, rather than the actual tonal values of the image.