diff --git a/html2docx/image.py b/html2docx/image.py
index a8465aa..bedbc32 100644
--- a/html2docx/image.py
+++ b/html2docx/image.py
@@ -16,6 +16,7 @@
 # In LibreOffice, the maximum height for an image is capped to USABLE_HEIGHT.
 USABLE_HEIGHT = Inches(8.1)
 USABLE_WIDTH = Inches(5.8)
+DEFAULT_DPI = 72
 
 MAX_IMAGE_SIZE = 10 * 1024 * 1024  # 10 MiB
 
@@ -104,11 +105,23 @@ def image_size(
     """
     image = Image.from_blob(image_buffer.getbuffer())
 
-    height = image.px_height if height_px is None else height_px
-    width = image.px_width if width_px is None else width_px
+    # Normalize image size to inches.
+    # - Without a specified pixel size, images are their actual pixel size, so that
+    #   images of the same pixel size appear the same size in the document, regardless
+    #   of their resolution.
+    # - With a specified pixel size, images should take the specified size, regardless
+    #   of their resolution.
+    if height_px is None:
+        height = image.px_height / image.vert_dpi
+    else:
+        height = height_px / DEFAULT_DPI
+    if width_px is None:
+        width = image.px_width / image.horz_dpi
+    else:
+        width = width_px / DEFAULT_DPI
 
-    height = Inches(height / image.vert_dpi)
-    width = Inches(width / image.horz_dpi)
+    height = Inches(height)
+    width = Inches(width)
 
     size = {}
     if width > USABLE_WIDTH:
diff --git a/tests/data/img_height.json b/tests/data/img_height.json
index 182d0c7..631469e 100644
--- a/tests/data/img_height.json
+++ b/tests/data/img_height.json
@@ -7,8 +7,8 @@
                 "shapes": [
                     {
                         "type": 3,
-                        "width": 2857500,
-                        "height": 2857500
+                        "width": 3810000,
+                        "height": 3810000
                     }
                 ]
             }
diff --git a/tests/data/img_ratio.json b/tests/data/img_ratio.json
index 9f09d34..c901760 100644
--- a/tests/data/img_ratio.json
+++ b/tests/data/img_ratio.json
@@ -7,8 +7,8 @@
                 "shapes": [
                     {
                         "type": 3,
-                        "width": 190500,
-                        "height": 95250
+                        "width": 254000,
+                        "height": 127000
                     }
                 ]
             }
diff --git a/tests/data/img_width.json b/tests/data/img_width.json
index 182d0c7..631469e 100644
--- a/tests/data/img_width.json
+++ b/tests/data/img_width.json
@@ -7,8 +7,8 @@
                 "shapes": [
                     {
                         "type": 3,
-                        "width": 2857500,
-                        "height": 2857500
+                        "width": 3810000,
+                        "height": 3810000
                     }
                 ]
             }
diff --git a/tests/test_image_size.py b/tests/test_image_size.py
index 6f663fd..71a936d 100644
--- a/tests/test_image_size.py
+++ b/tests/test_image_size.py
@@ -2,19 +2,19 @@
 
 from docx.shared import Inches
 
-from html2docx.image import USABLE_HEIGHT, USABLE_WIDTH, image_size
+from html2docx.image import DEFAULT_DPI, USABLE_HEIGHT, USABLE_WIDTH, image_size
 
-from .utils import DPI, PROJECT_DIR, generate_image
+from .utils import PROJECT_DIR, generate_image
 
 broken_image = PROJECT_DIR / "html2docx" / "image-broken.png"
 broken_image_bytes = broken_image.read_bytes()
 
 
-def inches_to_px(inches: int, dpi: int = DPI) -> int:
+def inches_to_px(inches: int, dpi: int = DEFAULT_DPI) -> int:
     return ceil(inches / Inches(1) * dpi)
 
 
-def px_to_inches(px: int, dpi: int = DPI) -> int:
+def px_to_inches(px: int, dpi: int = DEFAULT_DPI) -> int:
     return ceil(px * Inches(1) / dpi)
 
 
@@ -77,15 +77,29 @@ def test_resize_exceeds_height():
     assert size == {"height": USABLE_HEIGHT}
 
 
-def test_dpi_width():
+def test_no_pixel_size_uses_dpi_width():
     width_px = inches_to_px(USABLE_WIDTH, 300)
     image = generate_image(width=width_px, height=1, dpi=(300, 300))
     size = image_size(image)
     assert size == {}
 
 
-def test_dpi_height():
+def test_no_pixel_size_uses_dpi_height():
     height_px = inches_to_px(USABLE_HEIGHT, 300)
     image = generate_image(width=1, height=height_px, dpi=(300, 300))
     size = image_size(image)
     assert size == {}
+
+
+def test_pixel_size_specified_ignores_dpi_width():
+    width_px = inches_to_px(Inches(1))
+    image = generate_image(width=width_px, height=1, dpi=(300, 300))
+    size = image_size(image, width_px=width_px)
+    assert size == {"width": Inches(1)}
+
+
+def test_pixel_size_specified_ignores_dpi_height():
+    height_px = inches_to_px(Inches(1))
+    image = generate_image(width=1, height=height_px, dpi=(300, 300))
+    size = image_size(image, height_px=height_px)
+    assert size == {"height": Inches(1)}
diff --git a/tests/utils.py b/tests/utils.py
index 13b9df8..3c22b0d 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -3,12 +3,13 @@
 
 from PIL import Image
 
+from html2docx.image import DEFAULT_DPI
+
 TEST_DIR = pathlib.Path(__file__).parent.resolve(strict=True)
 PROJECT_DIR = TEST_DIR.parent
-DPI = 72
 
 
-def generate_image(width: int, height: int, dpi=(DPI, DPI)) -> BytesIO:
+def generate_image(width: int, height: int, dpi=(DEFAULT_DPI, DEFAULT_DPI)) -> BytesIO:
     data = BytesIO()
     with Image.new("L", (width, height)) as image:
         image.save(data, format="png", dpi=dpi)