ImageOverlay
Syntax
ImageOverlay( image1, image2 [, rule] [, transparency] )
Or as a member:
someImage.overlay( imageToDraw [, rule] [, transparency] )
Arguments
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
andimage2
can beBoxImage
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.
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