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Container functions Container functions calculate, manipulate, and report on data in container fields. Click a function name for details. This function Returns GetHeight The height of the image in a container field that holds images. GetThumbnail An image stored in the container field, resized according to specified values for width and height. GetWidth The width of the image in a container field that holds images. VerifyContainer A Boolean value representing the state of container data that’s stored externally. A False result means that files saved externally were changed or deleted.