update utils

utils/image_utils.py

@@ -20,13 +20,28 @@ def tensor_to_base64_string(
     Returns:
         Base64 encoded string of the image.
     """
-    pil_image = _tensor_to_pil(image_tensor, total_pixels=total_pixels)
+    pil_image = tensor_to_pil(image_tensor)
+    # pil_image = _tensor_to_pil(image_tensor, total_pixels=total_pixels)
     img_byte_arr = _pil_to_bytesio(pil_image, mime_type=mime_type)
     img_bytes = img_byte_arr.getvalue()
     # Encode bytes to base64 string
     base64_encoded_string = base64.b64encode(img_bytes).decode("utf-8")
     return base64_encoded_string
-
+# tensor to pil
+def tensor_to_pil(image: torch.Tensor) -> Image.Image:
+    if len(image.shape) > 3:
+        image = image[0]
+    image_np = image.cpu().numpy()
+    if image_np.shape[0] == 3:
+        image_np = image_np.transpose(1, 2, 0)
+    image_np = (image_np * 255).clip(0, 255).astype('uint8')
+    return Image.fromarray(image_np)
+# pil to tensor
+def pil_to_tensor(pil_image):
+    image_np = np.array(pil_image).astype(np.float32) / 255.0
+    image_tensor = torch.from_numpy(image_np).unsqueeze(0) 
+    return image_tensor
+    
 def _tensor_to_pil(image: torch.Tensor, total_pixels: int = 2048 * 2048) -> Image.Image:
     """Converts a single torch.Tensor image [H, W, C] to a PIL Image, optionally downscaling."""
     if len(image.shape) > 3: