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.
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
I = peaks(200);
bwMask = eye(200);
imshow(I, , 'Colormap', hot);
alphamask(bwMask, [0 0 1], 0.5);
See also IMSHOW, CREATEMASK
Andrew Davis (2020). ALPHAMASK: semi-transparent image overlay (https://www.mathworks.com/matlabcentral/fileexchange/34936-alphamask-semi-transparent-image-overlay), MATLAB Central File Exchange. Retrieved .
Thank you davis, that's exactly what i'm looking for
Thanks for the comment, Scott. I was using the square brackets to indicate that those arguments are optional, but I can see how it could be construed to mean that the last three arguments should be given as a single vector. Maybe alphamask(bwMask, [colour], [transparency], [axHandle]) would be more clear...
Great function. FYI, you have a small typo in your usage comments. Line 10 should read:
% hOVM = alphamask(bwMask, [colour], transparency, axHandle)
Inspired by: Image overlay