How can I plot parts of an image on a pcolor surface

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loghman
loghman 2016-11-6
编辑： loghman 2016-11-9
I have a pcolor surface and also I have an image which I want to empty the black section of the image and put the reminding image on the pcolor so that the pcolor can be shown under the black section of the image and the reminding parts of the image, covers the pcolor.
my pcolor:
my image:
  2 个评论
loghman
loghman 2016-11-6
I have a X,Y,Z data that I use them to plot surface(with surf or pcolor) and the image.
my code:
[x,y] = meshgrid(1:1000,1:1000);
z = x^3-sqrt(y);
I = imread('mymap.png');
imshow(I, 'InitialMag', 'fit')
hold on
k = pcolor(x,y,z);
shading interp
colormap jet
but after plotting, the surface covers entire image hold off

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回答（1 个）

Image Analyst
Image Analyst 2016-11-6
Set the alpha channel. Here is how to do it:
Steve Eddins's blog:
http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/
  9 个评论
显示 7更早的评论
Image Analyst
Image Analyst 2016-11-8
Can you provide an image where the region inside the country is black? Come on, make it easy for us to help you, not hard.
loghman
loghman 2016-11-9
编辑：loghman 2016-11-9
The link of the image that you want:
https://s16.postimg.org/wnsw1mtj9/mymap.jpg

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