Although they cannot represent data like other View Widgets can, images do have internal methods that can be invoked by other Control Widgets/Objects. See the Inter-Widget Communications document for the list of available methods for each object/widget.
Parameter="file" value="image" — Specifies the image to use. Images can be either .GIF, .JPG or .PNG.
Parameter="invisible" value="CHECKED" or "UNCHECKED" — Specifies if the Image is to start out invisible or not. If the attribute is UNCHECKED, then by default the Image is visible. If the Image starts out invisible, the only way to make it visible again is via the IWC method reappear().
Parameter="cacheImage" value="CHECKED or UNCHECKED" — A checkbox that specifies to GEMstudio to store this image in the SDRAM in an uncompressed format for immediate use from any page within the project. All cached images are loaded into SDRAM prior to the first page being displayed, so the more images that are cached, the longer it will take for the initial page to be displayed. Since the image is written to the SDRAM only once per project, it is not suitable for images that contain transparencies. (Images can be either .GIF, .JPG, or .PNG.)
Parameter="noSdram" value="CHECKED" or "UNCHECKED" — Specifies if the image is loaded into page specific SDRAM or not. Loading the image into the SDRAM allows the disappear and/or reappear methods to transition faster. If the image will not be made to disappear or reappear, there is nothing to be gained by using the SDRAM, so noSdram should probably be set to CHECKED.