Background of Gui is displaying in low quality

I am using the following code to display a background on my gui. However, the quality of the background is significantly lower than the source picture. I have tried using pngs and jpegs. This is the code I am using to set my background image.

ah = axes('unit', 'normalized', 'position', [0 0 1 1]); bg = imread('aAndABack.jpg'); imagesc(bg); set(ah,'handlevisibility','off','visible','off') uistack(ah, 'bottom');