MATLAB: How to make a grayscale image semi transparent

image processingMATLAB

I have two grayscale images in which one of them is registered to the other.

How can I make the mapping image semitransparent and overlay it on the registered image?

Note both pictures are gray scale.

Thanks, Shayan

Best Answer

Both image() and imagesc() construct objects of class "image"; "image" objects have an AlphaData property. You can either set() that property after the return from image() or imagesc(), or you can pass a name/value pair for AlphaData as part of the image() or imagesc() call

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MATLAB: How to make errorbar transparent

Unlike many line plots, the color property cannot be used to set transparency in errorbar().

Transparency can be set from within the hidden Bar and Line objects that represent the errorbars and trend line, respectively.

% Plot errorbars
cla
hold on
plot(rand(20),rand(20)*2-.5, 'yo', 'MarkerFaceColor', 'k', 'MarkerSize', 15, 'LineWidth', 1.5);
h = errorbar(linspace(0,1,5), linspace(0,1,5), .5*ones(1,5), 'r', 'LineWidth', 10);
% Set transparency level (0:1)
alpha = 0.65;   
% Set transparency (undocumented)
set([h.Bar, h.Line], 'ColorType', 'truecoloralpha', 'ColorData', [h.Line.ColorData(1:3); 255*alpha])

MATLAB: How to return gray image to rgb or index image so that it will be coulor image

You cannot really do that. See http://www.mathworks.co.uk/matlabcentral/answers/86054-gray-image-to-rgb-using-ind2rgb

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MATLAB: How to make errorbar transparent

MATLAB: How to return gray image to rgb or index image so that it will be coulor image

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