Change the resolution of an image created/opened with imshow

Hello,

I'm making a random-black&white-dot background (random-dot stereogram). For that purpose I create a matrix composed by zeros and ones with the function I downloaded from a website (http://www.cns.atr.jp/~kmtn/imageMatlab/index.html). The function is called "randDot" and looks like:

function im = randDot(vhSize, dotSize, dotCol, backCol, density)

Then I establish the size of the image, dot color (black), background color (white) and density (0.5) and generate the image using IMSHOW as:

figure(1); imshow(im);

My problem comes when I want to visualize the image. When I choose a image size bigger than 1000x1000 (pixels?? Is it not defined in code) the function IMSHOW scales the entire image to fit in the window. How can I get an image as big as I want? Another option could be creating a picture with high resolution and scale it with another program, but, which is the resolution of the image generated by IMSHOW? Is it fixed or can I change it. Is there any better function to make it?

Thanks.

Answer 1

[Sarah Wait Zaranek]

I think you can solve this by changing the 'InitialMagnification' property to change the magnification used to display the image.

You can get your default settings by:

iptgetpref('ImshowInitialMagnification')

There is more about this property in the documentation here: http://www.mathworks.com/help/toolbox/images/ref/imshow.html

Here is a small code example to show using the property:

>> I = imread('cameraman.tif');
>> imshow(I,'InitialMagnification',100) % 100 percent
>> imshow(I,'InitialMagnification',20)  % 20 percent