setting transparancy of legend?

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Micke Malmström
Micke Malmström 2017-1-12
回答： Afiq Azaibi 2024-4-26，19:53
Is it possible to make the background of the legend be slighly transparent so that the lines behind it can be somewat visible?
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Walter Roberson
Walter Roberson 2017-1-16
I will not say that it is impossible at the moment. It is certainly not documented. You just might be able to change it using one of the hidden properties of the legend. Perhaps one of the ColorSpace properties. Nothing I have tried has worked yet.

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alice
alice 2017-6-27
In undocumented Matlab, you will find how to do it here: http://undocumentedmatlab.com/blog/transparent-legend.

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Ilja Maljutenko
Ilja Maljutenko 2021-5-19
This solution seems to work in Matlab 2020 +
h_leg.BoxFace.ColorType='truecoloralpha';
h_leg.BoxFace.ColorData=uint8(255*[1 1 1 0.75]');
where h_leg is your legend box handle.
source: https://se.mathworks.com/matlabcentral/answers/97850-how-do-i-make-the-background-of-a-plot-legend-transparent#comment_847440
Wilson A N
Wilson A N 2017-1-16
编辑：Walter Roberson 2017-1-16
You can refer to the link given below on how to set the different properties of legend
https://www.mathworks.com/help/matlab/ref/legend-properties.html
To change the background color of the legend you can change the 'Color' field to achieve the required transparency.
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Afiq Azaibi
Afiq Azaibi 2024-4-26，19:53
Ran in:
Starting in R2024a, legend supports the ability to control the level of transparency with the BackgroundAlpha property. Below is a short example:
plot(magic(7));
grid on;
set(gca, 'Color', [.88 .88 .88]);
l = legend(BackgroundAlpha=.7);
Setting the value to 0 will make it fully transparent and a value 1 of will make it fully opaque which is the default behavior.
Rectangle also has a new FaceAlpha property and you can read more about both in this blog post.

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