Static Image Files

Static image files are used in Traffic Channel to present those images on the display map which do not change, e.g. roadway banners, town name banners, the map background, and video banners. Image files must be in Portable Network Graphics format (.PNG) and must be no larger than 640x480 (the area of the map background). All colors used in the image file must be defined in the 16-color palette of the Color Table Definition of the map configuration file. Image files are stored in the directory \TrafficChannel\StaticImages.

Images are located on the map by specifying an (x,y) pixel coordinate which is used to place the upper-left corner of the image. Note that images must fit within the 640x480 pixel region of the display.

Images are either drawn on the screen or rendered in the order presented in the map configuration file. If image locations overlap, the images drawn later will cover, or sit on top of, those drawn earlier. Therefore, images such as the background should be listed first in the configuration file.

The Adobe Photoshop program is recommended for previewing, modifying, and creating PNG files for use with Traffic Channel.

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(May 11, 1998)