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

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

[Image Analyst]

What color did you want? Did you try making the color of the figure and the color of the axes background the same?

[Erwin Avendaño]

I want the image to be seen without background in the guide

[Guillaume]

Your question is really not clear. What background are you talking about?

Are you actually asking how to handle a PNG with a transparency channel (or a transparent colour)? And wanting that transparency to be applied correctly?

[Erwin Avendaño]

Exact

[Erwin Avendaño]

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

Answer 1

[Walter Roberson]

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)

[giannit]

@Walter Roberson i tried it with imshow() in R2021a but gives error: The parameter, AlphaData, is not recognized by imageDisplayParsePVPairs

[Walter Roberson]

Ah, in that case use image(), or use

[YourImage, ~, ImageAlpha] = imread('YourFile.png');
h = imshow(YourImage);
h.AlphaData = ImageAlpha;

[giannit]

@Walter Roberson yes i need imshow(), many thanks walter you are da real mvp

Answer 2

[Joseph Stover]

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.

[Sebastian Cuenca]

mmm I tried it but it just set a white background on image...