Added getrgb hsb color string

Tests/test_imagecolor.py

@@ -82,6 +82,10 @@ class TestImageColor(PillowTestCase):
         self.assertEqual((255, 0, 0), ImageColor.getrgb("hsv(360,100%,100%)"))
         self.assertEqual((0, 255, 255), ImageColor.getrgb("hsv(180,100%,100%)"))
 
+        # alternate format
+        self.assertEqual(ImageColor.getrgb("hsb(0,100%,50%)"),
+                         ImageColor.getrgb("hsv(0,100%,50%)"))
+
         # floats
         self.assertEqual((254, 3, 3), ImageColor.getrgb("hsl(0.1,99.2%,50.3%)"))
         self.assertEqual((255, 0, 0), ImageColor.getrgb("hsl(360.,100.0%,50%)"))
@@ -100,6 +104,8 @@ class TestImageColor(PillowTestCase):
                          ImageColor.getrgb("hsl(0,100%,50%)"))
         self.assertEqual(ImageColor.getrgb("HSV(0,100%,50%)"),
                          ImageColor.getrgb("hsv(0,100%,50%)"))
+        self.assertEqual(ImageColor.getrgb("HSB(0,100%,50%)"),
+                         ImageColor.getrgb("hsb(0,100%,50%)"))
 
         # space agnosticism
         self.assertEqual((255, 0, 0),

docs/reference/ImageColor.rst

@@ -34,7 +34,9 @@ The ImageColor module supports the following string formats:
 * Hue-Saturation-Value (HSV) functions, given as ``hsv(hue, saturation%,
   value%)`` where hue and saturation are the same as HSL, and value is between
   0% and 100% (black=0%, normal=100%). For example, ``hsv(0,100%,100%)`` is
-  pure red.
+  pure red. This format is also known as Hue-Saturation-Brightness (HSB), and
+  can be given as ``hsb(hue, saturation%, brightness%)``, where each of the
+  values are used as they are in HSV.
 
 * Common HTML color names. The :py:mod:`~PIL.ImageColor` module provides some
   140 standard color names, based on the colors supported by the X Window

src/PIL/ImageColor.py

@@ -101,7 +101,7 @@ def getrgb(color):
             int(rgb[2] * 255 + 0.5)
             )
 
-    m = re.match(r"hsv\(\s*(\d+\.?\d*)\s*,\s*(\d+\.?\d*)%\s*,\s*(\d+\.?\d*)%\s*\)$", color)
+    m = re.match(r"hs[bv]\(\s*(\d+\.?\d*)\s*,\s*(\d+\.?\d*)%\s*,\s*(\d+\.?\d*)%\s*\)$", color)
     if m:
         from colorsys import hsv_to_rgb
         rgb = hsv_to_rgb(