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A tool node can have a number of image inputs or outputs.

Image Inputs can be defined easily shown here in this code snippet.
--Image, Masks Inputs
InImage = self:AddInput("Background", "Background", { LINKID_DataType = "Image",
LINK_Main = 1,
})
InImage2 = self:AddInput("Image2", "Image2", { LINKID_DataType = "Image",
LINK_Main = 2, INP_Required = false,
})
-- Create an output image
OutImage = self:AddOutput("Output", "Output", { LINKID_DataType = "Image",
LINK_Main = 1,
})