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

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?

[sixwwwwww]

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

[Rafael Freire]

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

Answer 1

[sixwwwwww]

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

[Tejas Waje]

If I have a background image and I need to use a foreground image with some part transparent , what should I do?

Answer 2

[barbara anderson]

Convert it into greyscale image and plot it.