GUI: how to insert png image with original resolution and transparent background?

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geomod
geomod 2011-8-31
I found that inserting images is done by the axes object. I can show the image (16x16 pixels) in my GUI, but it's always magnified, and the transparent background is rendered black. How can I fix this?
Thanks!

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回答（1 个）

Arturo Moncada-Torres
To keep your image in its original scale, you have include the following line just after the one where you display the image in the axes (with image, imagesc or imshow):
axis image;
Regarding the transparent background, I suggest you to take a look at this MATLAB Newsgroup thread. I think your question is answered here.
  2 个评论
geomod
geomod 2011-9-1
Hi Arturo,
With your hint the image still was not shown in its original resolution and correct height-width ratio. Eventually I could fix it by adjusting the Units property of the axes object to pixels and manually adjusting height and width under Position.
Thanks for the thread hint! It made me look for the alpha channel which seemed not available for the image I was using. With some simple image editing I colored the 'transparent' part of the image to the grey color of the GUI.
Regards
Arturo Moncada-Torres
Arturo Moncada-Torres 2011-9-1
Yes, your solution for keeping the image in its original scale would work, but it is not practical (suppose you change of image, you would have to do it again!).
Suppose you have the axes' handle in a variable called h. Try it this way:
axis(h, 'image')
Regarding the alpha channel issue, I am glad it worked ;-)

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