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Image Size
The Image Size node outputs the size that the given image occupies in the coordinate space.
The size of an image may change depending on operations applied to it, as, for instance, using a Scale node.
Here is an example where this happens:

Inputs and Outputs
Inputs:
Image (Image): The input image.
Outputs:
Size (Vector 2): The image's size, with thexcomponent of the vector being the width and theycomponent being the height.