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There are two types of image lists: nonmasked and masked. A nonmasked image list consists of a color bitmap that contains one or more images. A masked image list consists of two bitmaps of equal size. The first is a color bitmap that contains the images, and the second is a monochrome bitmap that contains a series of masks one for each image in the first bitmap.

When a nonmasked image is drawn, it is simply copied into the target device context; that is, it is drawn over the existing background color of the device context. When a masked image is drawn, the bits of the image are combined with the bits of the mask, typically producing transparent areas in the bitmap where the background color of the target device context shows through. There are several drawing styles that you can specify when drawing a masked image. For example, you can specify that the image be dithered to indicate a selected object. For more information about drawing images, see Drawing Images.

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