diff --git a/Tests/test_imagechops.py b/Tests/test_imagechops.py
index 022c7256765..3378b6bd049 100644
--- a/Tests/test_imagechops.py
+++ b/Tests/test_imagechops.py
@@ -38,8 +38,8 @@ def test_sanity():
     ImageChops.blend(im, im, 0.5)
     ImageChops.composite(im, im, im)
 
-    ImageChops.softlight(im, im)
-    ImageChops.hardlight(im, im)
+    ImageChops.soft_light(im, im)
+    ImageChops.hard_light(im, im)
     ImageChops.overlay(im, im)
 
     ImageChops.offset(im, 10)
@@ -366,26 +366,26 @@ def test_subtract_modulo_no_clip():
         self.assertEqual(new.getpixel((50, 50)), (241, 167, 127))
 
 
-def test_softlight(self):
+def test_soft_light(self):
     # Arrange
     im1 = Image.open("Tests/images/hopper.png")
     im2 = Image.open("Tests/images/hopper-XYZ.png")
 
     # Act
-    new = ImageChops.softlight(im1, im2)
+    new = ImageChops.soft_light(im1, im2)
 
     # Assert
     self.assertEqual(new.getpixel((64, 64)), (163, 54, 32))
     self.assertEqual(new.getpixel((15, 100)), (1, 1, 3))
 
 
-def test_hardlight(self):
+def test_hard_light(self):
     # Arrange
     im1 = Image.open("Tests/images/hopper.png")
     im2 = Image.open("Tests/images/hopper-XYZ.png")
 
     # Act
-    new = ImageChops.hardlight(im1, im2)
+    new = ImageChops.hard_light(im1, im2)
 
     # Assert
     self.assertEqual(new.getpixel((64, 64)), (144, 50, 27))
diff --git a/docs/reference/ImageChops.rst b/docs/reference/ImageChops.rst
index 31142cc3fd2..fb742254903 100644
--- a/docs/reference/ImageChops.rst
+++ b/docs/reference/ImageChops.rst
@@ -36,8 +36,8 @@ operations in this module).
 .. autofunction:: PIL.ImageChops.logical_or
 .. autofunction:: PIL.ImageChops.logical_xor
 .. autofunction:: PIL.ImageChops.multiply
-.. autofunction:: PIL.ImageChops.softlight
-.. autofunction:: PIL.ImageChops.hardlight
+.. autofunction:: PIL.ImageChops.soft_light
+.. autofunction:: PIL.ImageChops.hard_light
 .. autofunction:: PIL.ImageChops.overlay
 .. py:method:: PIL.ImageChops.offset(image, xoffset, yoffset=None)
 
diff --git a/src/PIL/ImageChops.py b/src/PIL/ImageChops.py
index 1dc456156c8..2d13b529fef 100644
--- a/src/PIL/ImageChops.py
+++ b/src/PIL/ImageChops.py
@@ -139,7 +139,7 @@ def screen(image1, image2):
     return image1._new(image1.im.chop_screen(image2.im))
 
 
-def softlight(image1, image2):
+def soft_light(image1, image2):
     """
     Superimposes two images on top of each other using the Soft Light algorithm
 
@@ -148,10 +148,10 @@ def softlight(image1, image2):
 
     image1.load()
     image2.load()
-    return image1._new(image1.im.chop_softlight(image2.im))
+    return image1._new(image1.im.chop_soft_light(image2.im))
 
 
-def hardlight(image1, image2):
+def hard_light(image1, image2):
     """
     Superimposes two images on top of each other using the Hard Light algorithm
 
@@ -160,7 +160,7 @@ def hardlight(image1, image2):
 
     image1.load()
     image2.load()
-    return image1._new(image1.im.chop_hardlight(image2.im))
+    return image1._new(image1.im.chop_hard_light(image2.im))
 
 
 def overlay(image1, image2):
diff --git a/src/_imaging.c b/src/_imaging.c
index 7875ae27817..f40b19e4dfa 100644
--- a/src/_imaging.c
+++ b/src/_imaging.c
@@ -2407,7 +2407,7 @@ _chop_subtract_modulo(ImagingObject* self, PyObject* args)
 }
 
 static PyObject*
-_chop_softlight(ImagingObject* self, PyObject* args)
+_chop_soft_light(ImagingObject* self, PyObject* args)
 {
     ImagingObject* imagep;
 
@@ -2418,7 +2418,7 @@ _chop_softlight(ImagingObject* self, PyObject* args)
 }
 
 static PyObject*
-_chop_hardlight(ImagingObject* self, PyObject* args)
+_chop_hard_light(ImagingObject* self, PyObject* args)
 {
     ImagingObject* imagep;
 
@@ -3357,8 +3357,8 @@ static struct PyMethodDef methods[] = {
     {"chop_and", (PyCFunction)_chop_and, 1},
     {"chop_or", (PyCFunction)_chop_or, 1},
     {"chop_xor", (PyCFunction)_chop_xor, 1},
-    {"chop_softlight", (PyCFunction)_chop_softlight, 1},
-    {"chop_hardlight", (PyCFunction)_chop_hardlight, 1},
+    {"chop_soft_light", (PyCFunction)_chop_soft_light, 1},
+    {"chop_hard_light", (PyCFunction)_chop_hard_light, 1},
     {"chop_overlay", (PyCFunction)_chop_overlay, 1},
 
 #endif