diff --git a/setup.py b/setup.py
index f007b8b..31d0d0d 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@ with open("requirements.txt") as f:
 
 setup(
     name="rembg",
-    version="1.0.18",
+    version="1.0.19",
     description="Remove image background",
     long_description=long_description,
     long_description_content_type="text/markdown",
diff --git a/src/rembg/bg.py b/src/rembg/bg.py
index fb9d3ab..04a9ed2 100644
--- a/src/rembg/bg.py
+++ b/src/rembg/bg.py
@@ -17,11 +17,11 @@ def alpha_matting_cutout(
     foreground_threshold,
     background_threshold,
     erode_structure_size,
+    base_size,
 ):
-    base_size = (1000, 1000)
     size = img.size
 
-    img.thumbnail(base_size, Image.LANCZOS)
+    img.thumbnail((base_size, base_size), Image.LANCZOS)
     mask = mask.resize(img.size, Image.LANCZOS)
 
     img = np.asarray(img)
@@ -83,6 +83,7 @@ def remove(
     alpha_matting_foreground_threshold=240,
     alpha_matting_background_threshold=10,
     alpha_matting_erode_structure_size=10,
+    alpha_matting_base_size=1000,
 ):
     model = get_model(model_name)
     img = Image.open(io.BytesIO(data)).convert("RGB")
@@ -95,6 +96,7 @@ def remove(
             alpha_matting_foreground_threshold,
             alpha_matting_background_threshold,
             alpha_matting_erode_structure_size,
+            alpha_matting_base_size,
         )
     else:
         cutout = naive_cutout(img, mask)
diff --git a/src/rembg/cmd/cli.py b/src/rembg/cmd/cli.py
index 45a4d6d..eeedfbf 100644
--- a/src/rembg/cmd/cli.py
+++ b/src/rembg/cmd/cli.py
@@ -55,6 +55,14 @@ def main():
         help="Size of element used for the erosion.",
     )
 
+    ap.add_argument(
+        "-az",
+        "--alpha-matting-base-size",
+        default=1000,
+        type=int,
+        help="The image base size.",
+    )
+
     ap.add_argument(
         "-p",
         "--path",
@@ -113,6 +121,7 @@ def main():
                             alpha_matting_foreground_threshold=args.alpha_matting_foreground_threshold,
                             alpha_matting_background_threshold=args.alpha_matting_background_threshold,
                             alpha_matting_erode_structure_size=args.alpha_matting_erode_size,
+                            alpha_matting_base_size=args.alpha_matting_base_size,
                         ),
                     )
 
@@ -126,6 +135,7 @@ def main():
                 alpha_matting_foreground_threshold=args.alpha_matting_foreground_threshold,
                 alpha_matting_background_threshold=args.alpha_matting_background_threshold,
                 alpha_matting_erode_structure_size=args.alpha_matting_erode_size,
+                alpha_matting_base_size=args.alpha_matting_base_size,
             ),
         )
 
diff --git a/src/rembg/cmd/server.py b/src/rembg/cmd/server.py
index 1a40ed1..022d773 100644
--- a/src/rembg/cmd/server.py
+++ b/src/rembg/cmd/server.py
@@ -35,7 +35,8 @@ def index():
     af = request.values.get("af", type=int, default=240)
     ab = request.values.get("ab", type=int, default=10)
     ae = request.values.get("ae", type=int, default=10)
-    
+    az = request.values.get("az", type=int, default=1000)
+
     model = request.args.get("model", type=str, default="u2net")
     if model not in ("u2net", "u2netp"):
         return {"error": "invalid query param 'model'"}, 400
@@ -44,12 +45,13 @@ def index():
         return send_file(
             BytesIO(
                 remove(
-                    file_content, 
+                    file_content,
                     model_name=model,
                     alpha_matting=alpha_matting,
                     alpha_matting_foreground_threshold=af,
                     alpha_matting_background_threshold=ab,
-                    alpha_matting_erode_structure_size=ae
+                    alpha_matting_erode_structure_size=ae,
+                    alpha_matting_base_size=az,
                 )
             ),
             mimetype="image/png",