The image displayed in the Prizm® Viewer image viewing window can be sized and positioned. You can use a list file to set initialization properties that specify image positioning, scaling, etc. Or, you can use scripting in the web page to set property values or invoke methods to control image positioning, rotation, etc. Prizm Viewer always attempts to position the image as requested, but the requested positioning is subject to constraints.

When Prizm Viewer displays an image in the image viewing window, the image position performs as follows:

• When the image is scaled larger than the image window, image pixels touch at least two opposing sides of the image window.
• When the image is scaled smaller than the image window, the image is centered horizontally and vertically in the image window.

For example, if an attempt is made to center the image at coordinate (0,0), it would try to center the upper-left corner of the image in the image window. Prizm Viewer does not place the upper-left corner of the image in the center of the image window, but it does position the image such that the upper-left corner of the image is visible in the image viewing window.

Examples of the image centered in the window:

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