feat(nodes): add RealESRGAN_x2plus.pth, update upscale nodes

- add `RealESRGAN_x2plus.pth` model to installer
- add `RealESRGAN_x2plus.pth` to `realesrgan` node
- rename `RealESRGAN` to `ESRGAN` in nodes
- make `scale_factor` optional in `img_scale` node

invokeai/app/invocations/image.py

@@ -437,8 +437,8 @@ class ImageScaleInvocation(BaseInvocation, PILInvocationConfig):
     type: Literal["img_scale"] = "img_scale"
 
     # Inputs
-    image:       Optional[ImageField] = Field(default=None, description="The image to scale")
-    scale_factor:                  float = Field(gt=0, description="The factor by which to scale the image")
+    image:          Optional[ImageField] = Field(default=None, description="The image to scale")
+    scale_factor:        Optional[float] = Field(default=2.0, gt=0, description="The factor by which to scale the image")
     resample_mode:  PIL_RESAMPLING_MODES = Field(default="bicubic", description="The resampling mode")
     # fmt: on
 

invokeai/app/invocations/upscale.py

@@ -1,6 +1,6 @@
 # Copyright (c) 2022 Kyle Schouviller (https://github.com/kyle0654) & the InvokeAI Team
-from pathlib import Path, PosixPath
-from typing import Literal, Union, cast
+from pathlib import Path
+from typing import Literal, Union
 
 import cv2 as cv
 import numpy as np
@@ -16,19 +16,20 @@ from .image import ImageOutput
 
 # TODO: Populate this from disk?
 # TODO: Use model manager to load?
-REALESRGAN_MODELS = Literal[
+ESRGAN_MODELS = Literal[
     "RealESRGAN_x4plus.pth",
     "RealESRGAN_x4plus_anime_6B.pth",
     "ESRGAN_SRx4_DF2KOST_official-ff704c30.pth",
+    "RealESRGAN_x2plus.pth",
 ]
 
 
-class RealESRGANInvocation(BaseInvocation):
+class ESRGANInvocation(BaseInvocation):
     """Upscales an image using RealESRGAN."""
 
-    type: Literal["realesrgan"] = "realesrgan"
+    type: Literal["esrgan"] = "esrgan"
     image: Union[ImageField, None] = Field(default=None, description="The input image")
-    model_name: REALESRGAN_MODELS = Field(
+    model_name: ESRGAN_MODELS = Field(
         default="RealESRGAN_x4plus.pth", description="The Real-ESRGAN model to use"
     )
 
@@ -65,19 +66,17 @@ class RealESRGANInvocation(BaseInvocation):
                 scale=4,
             )
             netscale = 4
-        # TODO: add x2 models handling?
-        # elif self.model_name in ["RealESRGAN_x2plus"]:
-        #     # x2 RRDBNet model
-        #     model = RRDBNet(
-        #         num_in_ch=3,
-        #         num_out_ch=3,
-        #         num_feat=64,
-        #         num_block=23,
-        #         num_grow_ch=32,
-        #         scale=2,
-        #     )
-        #     model_path = Path()
-        #     netscale = 2
+        elif self.model_name in ["RealESRGAN_x2plus.pth"]:
+            # x2 RRDBNet model
+            rrdbnet_model = RRDBNet(
+                num_in_ch=3,
+                num_out_ch=3,
+                num_feat=64,
+                num_block=23,
+                num_grow_ch=32,
+                scale=2,
+            )
+            netscale = 2
         else:
             msg = f"Invalid RealESRGAN model: {self.model_name}"
             context.services.logger.error(msg)

invokeai/backend/install/invokeai_configure.py

@@ -223,7 +223,7 @@ def download_conversion_models():
 
 # ---------------------------------------------
 def download_realesrgan():
-    logger.info("Installing RealESRGAN models...")
+    logger.info("Installing ESRGAN Upscaling models...")
     URLs = [
         dict(
             url = "https://github.com/xinntao/Real-ESRGAN/releases/download/v0.1.0/RealESRGAN_x4plus.pth",
@@ -240,6 +240,11 @@ def download_realesrgan():
             dest= "core/upscaling/realesrgan/ESRGAN_SRx4_DF2KOST_official-ff704c30.pth",
             description = "ESRGAN_SRx4_DF2KOST_official.pth",
         ),
+        dict(
+            url= "https://github.com/xinntao/Real-ESRGAN/releases/download/v0.2.1/RealESRGAN_x2plus.pth",
+            dest= "core/upscaling/realesrgan/RealESRGAN_x2plus.pth",
+            description = "RealESRGAN_x2plus.pth",
+        ),
     ]
     for model in URLs:
         download_with_progress_bar(model['url'], config.models_path / model['dest'], model['description'])