How do I prevent images displayed in a gui with imshow from being sized to fit the axes?

I built a gui that displays a folder of images one by one and lets the user select an object class to associate with each image. The images are all different dimensions, and large images show up fine, but small images are blown up to fit the axes, and you can't recognize what's in the image. How do I make the axes resize themselves to fit each image?

I'm using this code to display the image.

 g = imread(current_im)
 axes(handles.axes1);
 cla;
 imshow(g)

Answer 1

[Walter Roberson]

axis image;                    %sets data aspect ratio
oldunits = get(gca, 'Units');
set(gca, 'Units', 'pixels');
oldsize = get(gca, 'Position');
set(gca, 'Position', [oldsize(1), oldsize(2), size(g,1), size(g,2))
set(gca, 'Units', oldunits)

Answer 2

[Chad Greene]

Try this

A = repmat(imread('coins.png'),[6 6]); 
imshow(A,'InitialMagnification',100)
set(gcf,'position',[10 10 size(A,2) size(A,1)])
setpixelposition(gca,[0 0 size(A,2) size(A,1)])

[Walter Roberson]

Hmmm... setpixelposition() says

Distances in pixels are independent of your system resolution on Windows® and Macintosh systems:

• On Windows systems, a pixel is 1/96th of an inch.
• On Macintosh systems, a pixel is 1/72nd of an inch.

On Linux® systems, the size of a pixel is determined by your system resolution.

[Katie]

This worked on small images, but it screwed things up for large images. I ended up writing a function that adds zero padding to images if their dimensions are below a given value.