size

Specifies the size of the image for the screen overlay. A value of −1 indicates to use the native dimension A value of 0 indicates to maintain the aspect ratio A value of n sets the value of the dimension For example: A x value of -1 and y value of -1 in fractions indicates the image size equals its original x and y dimensions. A x value of -1 and y value of 0.2 in fractions indicates the image size equals its original x dimension and 20% of its y dimension. A x value of 100 and y value of 500 in pixels indicates the image is of size 100 pixels by 500 pixels. If not specified, the default is the original size of the image.