CODEWITHSUNDEEP
linuxmatlabmatlab-figurealpha-transparency
karl71
karl71

Reputation: 1092

AlphaData alternative in Matlab

In Matlab I'm plotting a matrix (let's call it M) using imagesc over an image using imshow. I would like M to have a degree of transparency so I can actually see the image below. This is what I'm doing:

    imshow(img); hold on;
    h = imagesc(M); 
    set(h,'AlphaData',0.4); % set transparency to 40%

However, the last line generates an error when running it on Linux. I've been trying to solve it but nothing seems to work. I wonder if there is an alternative to the "AlphaData" property to make it transparent. Thanks!

EDIT: I'm using Matlab R2014a and Java 1.7 on a Linux CentOS 6.6

Upvotes: 0

Views: 338

Answers (1)

karl71
karl71

Reputation: 1092

As Luis Mendo suggested, I just needed to change the renderer. You can:

>get(gcf,'renderer'); % to see which render engine is Matlab using
>set(gcf,'renderer'); % to get a list with all the possible renderers in your machine

So, at least in Linux, to change the renderer it's necessary to start Matlab from terminal by calling it as:

matlab -softwareopengl

Once this is done, setting transparency in an specific plot, as shown in the description of the question, is possible.

Upvotes: 2

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