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Once you have loaded an image into an IGPage Object (either by itself, or as part of an IGDocument Object), the most common thing to do with it is to display it on the computer screen. Usually, your application will only display a given image on the computer screen once. However, there are many situations where your application would need to display the same image more than once (for example, if you wanted to allow the end user to apply some alternate display settings, and your application needed to show "before" and "after" images at the same time).

The various controls used to determine the appearance on the computer screen are all bundled together in a single object called IGPageDisplay Object. Each IGPageDisplay Object is associated with one (and only one) IGPage Object, but a given IGPage Object can have any number (0, 1 or more) IGPageDisplays associated with it. Thus, in our example, our application would have one IGPageDisplay Object containing the image, and two IGPageDisplay Objects (one for the "before" view, one for the "after" view).

This section provides information about the following:

• IGPageDisplay and IGPageViewCtl
• IGPageDisplay Functions
• ImageRect, ClipRect, and DeviceRect
• Grayscale Look Up Tables
• Lookup Tables and Gamma Correction

 

 

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