overlayimages - Overlay an Image on another Image
Overlays two images to create a new image with the second image placed as an overlay. Uses the png file format for transparency. Canvas size is preserved.
The x position from top left corner. Defaults to 0.
The y position from top left corner. Defaults to 0.
Image in the background. Use png to preserve transparency.
This image is placed on top of the background image. Transparency is allowed (png only).