### How to make 1:1 matrix plots?

Hello,

I want to make a matrix_plot of an array, but it never displays correctly. How would I, for example, make each number in an array into a pixel? I find matrix_plot, in resizing, "corrupts" the image. For example, this is a plot of the Sierpinski ~~triangle:~~

triangle: http://img109.imageshack.us/img109/7189/sage0.png (it also does this on svg plots), and you can see the array isn't translating correctly to pixels. aspect_ratio=1 doesn't work. A sufficiently large figsize works, but I don't see why this is necessary. Isn't there another way?

Thank you.