ALPHAMASK: semi-transparent image overlay

Version 1.0.0.0 (1.77 KB) by Andrew Davis
Overlay image with semi-transparent mask and return handle
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Updated 6 Feb 2012

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ALPHAMASK: Overlay image with semi-transparent mask

Overlays a semi-transparent mask over an image. By default the
currently displayed figure is overlain.
Options include overlay colour and opacity.
Returns a handle to the overlay mask.

Usage:
hOVM = alphaMask(bwMask, [colour, transparency, axHandle])
bwMask: logical matrix representing mask
colour: vector of three rgb values in range [0, 1] (optional; default [0 0 1])
transparency: scalar in range [0, 1] representing overlay opacity (optional; default 0.6)
axHandle: handle to axes on which to operate (optional; default current axes)
hOVM: handle to overlay image is returned

Example:
figure;
I = peaks(200);
bwMask = eye(200);
imshow(I, [], 'Colormap', hot);
alphamask(bwMask, [0 0 1], 0.5);

See also IMSHOW, CREATEMASK

Cite As

Andrew Davis (2024). ALPHAMASK: semi-transparent image overlay (https://www.mathworks.com/matlabcentral/fileexchange/34936-alphamask-semi-transparent-image-overlay), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2011a
Compatible with any release
Platform Compatibility
Windows macOS Linux
Acknowledgements

Inspired by: Image overlay

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Version Published Release Notes
1.0.0.0