Abstract: Methods and apparatus are provided for displaying data categories each having a plurality of data subcategories. The apparatus comprises a display having a current luminous output capacity that is configured to produce a first visual presentation of first data subcategories and a second visual presentation of second data subcategories and a processor that is configured to control the display. The first data subcategories include one category displayed at ninety percent of the current luminous output capacity and other subcategories having a luminance difference of at least thirty percent of the current luminous output capacity. Second data subcategories have a common luminance that is thirty percent to sixty percent of the luminous output capacity of said display, a color saturation that is greater than seventy-five percent, and a transparency of at least forty percent.

Abstract: Methods and apparatuses are provided for changing the relative size of an image in a display that includes one or more edges that define a display area in which at least a portion of the image is displayed. The methods and apparatus provide for a zoom point, which corresponds to a point in the displayed image that is to be zoomed in the displayed image, to be selected. The relative size of the selected zoom point may then be changed while the selected zoom point is translated along a substantially straight zoom line that passes through the selected zoom point and extends between a central point in the display area and an edge point on the display area that is closest to the selected zoom point.