Adjust display size of image
truesize(fig,[mrows ncols]) adjusts the display size of an image. fig is a figure containing a single image or a single image with a colorbar. [mrows ncols] is a 1-by-2 vector that specifies the requested screen area (in pixels) that the image should occupy.
truesize(fig) uses the image height and width for [mrows ncols]. This results in the display having one screen pixel for each image pixel.
If you do not specify a figure, truesize uses the current figure.
Fit image to figure window.
Resize image and figure to show image at its 80-by-80 pixel size.