How to plot png images with transparent background?
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I've just used image(), and the transparent area are shown with black colour by default, however I need white background. I tried to use set(gcf,'color','white') but this cannot help.
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Walter Roberson
le 12 Avr 2018
When you image() pass in 'AlphaData', and the transparency data. The alpha needs to be floating point (not logical) in the range 0 to 1 and the same size as the image.
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Walter Roberson
le 12 Avr 2018
[img, map, alphachannel] = imread('YourImage.png');
image(img, 'AlphaData', alphachannel);
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Mr M.
le 12 Avr 2018
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Cris LaPierre
le 11 Sep 2019
Images get displayed in an axes. Even if the image doesn't have a background, it will at least originally display in an axes with a background color set to white. You can turn that off using
axis off
of
set(gca,'Color','none')
DGM
le 3 Nov 2022
Modifié(e) : DGM
le 3 Nov 2022
If you're trying to retain the original alpha content from the PNG file:
% read the image and its alpha
[inpict,~,alpha] = imread('peppers_rgba.png');
% show the image with the alpha from the file
image(inpict,'alphadata',im2double(alpha))
% set the axes background color if desired
set(gca,'color',[0.8 0.3 1])
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1178913/image.png)
If instead, your concern is how the transparent regions are visualized, then consider this example regarding display matting for transparent images.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1178918/image.png)
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