image mask

I want to plot a certain region in color on top of another gray scale image. Is there a way in matlab to make certain pixels in an image transparent?

Answer 1

[Walter Roberson]

For objects of type image, you can set() the AlphaData property to an array the same height and width as the image, with 0 being fully transparent and 1 being fully opaque.

Answer 2

[Image Analyst]

See Steve's blog:

http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/