How to overlay a surf and a picture ?

Hello there, I'm trying to a cartography from a file and a picture.

file=importdata('file.dat');
img=imread('picture.png');
x=0:1:100; %fil row
y=0:1:100; %file column
figure
hold on
surf(x,y,file);
shading interp
view (0,270); 
imshow(img);
hold off

But my problem is that I want a transparency on my picture. I want white pixels to be transparent..

Thank you very much for your help Dagan

[Geoff Hayes]

Dagan - you can start by looking at the following link Image Overlay Using Transparency which manipulates the AlphaData property of the graphics handle to allow certain regions of the image to be transparent. I think that you want to pay special attention to the second example.

From your question, is it the white pixels within your picture.png that you want to make transparent?

Answer 1

[Image Analyst]

Take a look at Sean's meshCanopy and see if that's what you're looking for:

http://www.mathworks.com/matlabcentral/fileexchange/29485-meshcanopy