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Can a PNG image be displayed without displaying the black fill in the guide?

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Erwin Avendaño
Erwin Avendaño 2017-11-5
评论： Sebastian Cuenca 2021-6-16
I want to show a PNG image without a background but when I put it in the guide I fill it with the color of black
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Erwin Avendaño
Erwin Avendaño 2017-11-6
that the image maintains transparency in the guide, since by showing it what the guide does does not keep the transparency, it is filled with transparent parts

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回答（2 个）

Walter Roberson
Walter Roberson 2017-11-6
When you image() or imagesc() or imshow(), pass an option 'AlphaData' that is an array with the desired transparency, with 1 meaning to show the image completely and 0 meaning not showing the image at all (that is, show the background completely there.)
If the PNG had alpha information stored with it that you read with imread() then you should be able to use that transparency information directly.
[YourImage, ~, ImageAlpha] = imread('YourFile.png');
image(YourImage, 'AlphaData', ImageAlpha)
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Walter Roberson
Walter Roberson 2021-4-24
Ah, in that case use image(), or use
[YourImage, ~, ImageAlpha] = imread('YourFile.png');
h = imshow(YourImage);
h.AlphaData = ImageAlpha;

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Joseph Stover
Joseph Stover 2021-3-9
I was just having a similar problem and I was able to fix it by opening each png in paint.net and saving it as a 24 bit png.

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