Get the current colorable artist. Specifically, returns the current
ScalarMappable instance (image or patch collection), or None if no images or patch collections have been defined. The commands
Image instances, and the commands
Collection instances. The current image is an attribute of the current axes, or the nearest earlier axes in the current figure that contains an image.
Historically, the only colorable artists were images; hence the name
gci (get current image).
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