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invokeai/app/invocations/spandrel_image_to_image.py

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+import torch
+
+from invokeai.app.invocations.baseinvocation import BaseInvocation, invocation
+from invokeai.app.invocations.fields import (
+    FieldDescriptions,
+    ImageField,
+    InputField,
+    UIType,
+    WithBoard,
+    WithMetadata,
+)
+from invokeai.app.invocations.model import ModelIdentifierField
+from invokeai.app.invocations.primitives import ImageOutput
+from invokeai.app.services.shared.invocation_context import InvocationContext
+from invokeai.backend.spandrel_image_to_image_model import SpandrelImageToImageModel
+
+
+@invocation("spandrel_image_to_image", title="Image-to-Image", tags=["upscale"], category="upscale", version="1.0.0")
+class SpandrelImageToImageInvocation(BaseInvocation, WithMetadata, WithBoard):
+    """Run any spandrel image-to-image model (https://github.com/chaiNNer-org/spandrel)."""
+
+    image: ImageField = InputField(description="The input image")
+    image_to_image_model: ModelIdentifierField = InputField(
+        title="Image-to-Image Model",
+        description=FieldDescriptions.spandrel_image_to_image_model,
+        ui_type=UIType.SpandrelImageToImageModel,
+    )
+
+    @torch.inference_mode()
+    def invoke(self, context: InvocationContext) -> ImageOutput:
+        image = context.images.get_pil(self.image.image_name)
+
+        # Load the model.
+        spandrel_model_info = context.models.load(self.image_to_image_model)
+
+        with spandrel_model_info as spandrel_model:
+            assert isinstance(spandrel_model, SpandrelImageToImageModel)
+
+            # Prepare input image for inference.
+            image_tensor = SpandrelImageToImageModel.pil_to_tensor(image)
+            image_tensor = image_tensor.to(device=spandrel_model.device, dtype=spandrel_model.dtype)
+
+            # Run inference.
+            image_tensor = spandrel_model.run(image_tensor)
+
+        # Convert the output tensor to a PIL image.
+        pil_image = SpandrelImageToImageModel.tensor_to_pil(image_tensor)
+        image_dto = context.images.save(image=pil_image)
+        return ImageOutput.build(image_dto)