How can I plot an image in matlab. This is giving me a Black png image!

Question

Rafael Freire 2013-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/108692-how-can-i-plot-an-image-in-matlab-this-is-giving-me-a-black-png-image

回答： barbara anderson 2020-4-15

URL ='http://structures.wishartlab.com/molecules/HMDB00126/image.png'
filename='test.png'
urlwrite(URL,filename)
[y,z]=imread(filename,'png');
figure, imshow(y);
colormap(z)

This is giving me a Black image! How can i Plot it without getting all black?

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sixwwwwww 2013-12-4

I am getting this image from your code. Is it correct?

Rafael Freire 2013-12-4

Yes its look like this but the correct one must be like this http://structures.wishartlab.com/molecules/HMDB00126/image.png

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Answer 1

sixwwwwww 2013-12-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/108692-how-can-i-plot-an-image-in-matlab-this-is-giving-me-a-black-png-image#answer_117328

编辑：sixwwwwww 2013-12-5

在 MATLAB Online 中打开

you can do it as follows:

URL ='http://structures.wishartlab.com/molecules/HMDB00126/image.png'
filename = 'test.png'
urlwrite(URL,filename)
y = imread(filename, 'BackgroundColor', [1 1 1]);
figure, imshow(y);

The problem here was to replace transparent pixels with some specific color. If we don't choose any specific color then MATLAB gives it black color