ImageOverlay

Syntax

ImageOverlay( image1, image2 [, rule] [, transparency] )

Or as a member:

someImage.overlay( imageToDraw [, rule] [, transparency] )

Arguments

Name	Type	Required	Default	Description
image1	any	Yes		The base image to overlay onto. Can be a BoxImage object or image name.
image2	any	Yes		The image to overlay. Can be a BoxImage object or image name.
rule	string	No	SRC_OVER	The compositing rule for overlay (e.g., "SRC_OVER", "SRC_ATOP").
transparency	numeric	No	0.25	The transparency level for the overlay (0.0 = fully transparent, 1.0 = opaque).

Returns

BoxImage — The base image with the overlay applied.

Description

Overlays one image (image2) onto another (image1) using the specified compositing rule and transparency. This allows for blending images with various effects, such as watermarking or combining graphics.

Example

// Overlay image2 onto image1 with default rule and transparency
result = ImageOverlay( image1, image2 );

// Overlay with custom rule and transparency
result = ImageOverlay( image1, image2, "SRC_ATOP", 0.5 );

// As a member function
image1.overlay( image2, "SRC_OVER", 0.75 );

Related BIFs

• ImageCopy
• ImageDrawImage
• ImageNew

Notes

• Both image1 and image2 can be BoxImage objects or the names of images in the current context.
• The rule argument determines how the overlay is composited. Common values include "SRC_OVER" and "SRC_ATOP".
• The operation modifies the base image in place when used as a member function.
• Returns the modified image object for chaining or further processing.