- add_transparency  v0.2 Make an image partially transparent.
- antialias_pixel  v0.1 Helper function to apply a certain weight of a certain color to a pixel in an image. The index of the resulting color is returned. The alpha channel (transparency) is supported.
- image_create_alpha  v0.1 Helper function to create a new blank image with transparency.
- overlay_image  v0.2 Overlay a transparent image on top of another image.
- rotate_image_alpha  v0.3 Rotate an image paying respect to transparency.
- round_corners  v0.2 Round the corners of an image. Transparency and anti-aliasing are supported.