feat(nodes): add thumbnail generation to DiskImageStorage

invokeai/app/api/routers/images.py

@@ -23,6 +23,16 @@ async def get_image(
     filename = ApiDependencies.invoker.services.images.get_path(image_type, image_name)
     return FileResponse(filename)
 
+@images_router.get("/{image_type}/thumbnails/{image_name}", operation_id="get_thumbnail")
+async def get_thumbnail(
+    image_type: ImageType = Path(description="The type of image to get"),
+    image_name: str = Path(description="The name of the image to get"),
+):
+    """Gets a thumbnail"""
+    # TODO: This is not really secure at all. At least make sure only output results are served
+    filename = ApiDependencies.invoker.services.images.get_path(image_type, 'thumbnails/' + image_name)
+    return FileResponse(filename)
+
 
 @images_router.post(
     "/uploads/",

invokeai/app/services/image_storage.py

@@ -9,6 +9,7 @@
 from typing import Dict
 
 from PIL.Image import Image
+from invokeai.app.util.save_thumbnail import save_thumbnail
 
 from invokeai.backend.image_util import PngWriter
 
@@ -66,6 +67,9 @@ def __init__(self, output_folder: str):
             Path(os.path.join(output_folder, image_type)).mkdir(
                 parents=True, exist_ok=True
             )
+            Path(os.path.join(output_folder, image_type, "thumbnails")).mkdir(
+                parents=True, exist_ok=True
+            )
 
     def get(self, image_type: ImageType, image_name: str) -> Image:
         image_path = self.get_path(image_type, image_name)
@@ -87,7 +91,11 @@ def save(self, image_type: ImageType, image_name: str, image: Image) -> None:
         self.__pngWriter.save_image_and_prompt_to_png(
             image, "", image_subpath, None
         )  # TODO: just pass full path to png writer
-
+        save_thumbnail(
+            image=image,
+            filename=image_name,
+            path=os.path.join(self.__output_folder, image_type, "thumbnails"),
+        )
         image_path = self.get_path(image_type, image_name)
         self.__set_cache(image_path, image)
 

invokeai/app/util/save_thumbnail.py

@@ -0,0 +1,25 @@
+import os
+from PIL import Image
+
+
+def save_thumbnail(
+    image: Image.Image,
+    filename: str,
+    path: str,
+    size: int = 256,
+) -> str:
+    """
+    Saves a thumbnail of an image, returning its path.
+    """
+    base_filename = os.path.splitext(filename)[0]
+    thumbnail_path = os.path.join(path, base_filename + ".webp")
+
+    if os.path.exists(thumbnail_path):
+        return thumbnail_path
+
+    image_copy = image.copy()
+    image_copy.thumbnail(size=(size, size))
+
+    image_copy.save(thumbnail_path, "WEBP")
+
+    return thumbnail_path