revert 255 -> max_value fix (#6826)

torchvision/prototype/transforms/functional/_color.py

@@ -313,7 +313,8 @@ def posterize(inpt: features.InputTypeJIT, bits: int) -> features.InputTypeJIT:
 
 
 def solarize_image_tensor(image: torch.Tensor, threshold: float) -> torch.Tensor:
-    if threshold > _FT._max_value(image.dtype):
+    bound = 1 if image.is_floating_point() else 255
+    if threshold > bound:
         raise TypeError(f"Threshold should be less or equal the maximum value of the dtype, but got {threshold}")
 
     return torch.where(image >= threshold, invert_image_tensor(image), image)
@@ -466,7 +467,7 @@ def invert_image_tensor(image: torch.Tensor) -> torch.Tensor:
     if image.dtype == torch.uint8:
         return image.bitwise_not()
     else:
-        return _FT._max_value(image.dtype) - image  # type: ignore[no-any-return]
+        return (1 if image.is_floating_point() else 255) - image  # type: ignore[no-any-return]
 
 
 invert_image_pil = _FP.invert