diff --git a/Tests/test_psdraw.py b/Tests/test_psdraw.py
index 31f0f493b..30cd1c2e0 100644
--- a/Tests/test_psdraw.py
+++ b/Tests/test_psdraw.py
@@ -1,6 +1,6 @@
 import os
 import sys
-from io import StringIO
+from io import BytesIO
 
 from PIL import Image, PSDraw
 
@@ -46,8 +46,12 @@ def test_draw_postscript(tmp_path):
 
 def test_stdout():
     # Temporarily redirect stdout
-    old_stdout = sys.stdout
-    sys.stdout = mystdout = StringIO()
+    old_stdout = sys.stdout.buffer
+
+    class MyStdOut:
+        buffer = BytesIO()
+
+    sys.stdout = mystdout = MyStdOut()
 
     ps = PSDraw.PSDraw()
     _create_document(ps)
@@ -55,4 +59,4 @@ def test_stdout():
     # Reset stdout
     sys.stdout = old_stdout
 
-    assert mystdout.getvalue() != ""
+    assert mystdout.buffer.getvalue() != b""
diff --git a/docs/handbook/tutorial.rst b/docs/handbook/tutorial.rst
index 6b68a0562..1102f09be 100644
--- a/docs/handbook/tutorial.rst
+++ b/docs/handbook/tutorial.rst
@@ -424,7 +424,7 @@ Drawing PostScript
         title = "hopper"
         box = (1*72, 2*72, 7*72, 10*72) # in points
 
-        ps = PSDraw.PSDraw() # default is sys.stdout
+        ps = PSDraw.PSDraw() # default is sys.stdout.buffer
         ps.begin_document(title)
 
         # draw the image (75 dpi)
diff --git a/src/PIL/PSDraw.py b/src/PIL/PSDraw.py
index c1bd933d3..d62d3fd65 100644
--- a/src/PIL/PSDraw.py
+++ b/src/PIL/PSDraw.py
@@ -26,39 +26,33 @@ from . import EpsImagePlugin
 class PSDraw:
     """
     Sets up printing to the given file. If ``fp`` is omitted,
-    :py:data:`sys.stdout` is assumed.
+    ``sys.stdout.buffer`` is assumed.
     """
 
     def __init__(self, fp=None):
         if not fp:
-            fp = sys.stdout
+            fp = sys.stdout.buffer
         self.fp = fp
 
-    def _fp_write(self, to_write):
-        if self.fp == sys.stdout:
-            self.fp.write(to_write)
-        else:
-            self.fp.write(bytes(to_write, "UTF-8"))
-
     def begin_document(self, id=None):
         """Set up printing of a document. (Write PostScript DSC header.)"""
         # FIXME: incomplete
-        self._fp_write(
-            "%!PS-Adobe-3.0\n"
-            "save\n"
-            "/showpage { } def\n"
-            "%%EndComments\n"
-            "%%BeginDocument\n"
+        self.fp.write(
+            b"%!PS-Adobe-3.0\n"
+            b"save\n"
+            b"/showpage { } def\n"
+            b"%%EndComments\n"
+            b"%%BeginDocument\n"
         )
-        # self._fp_write(ERROR_PS)  # debugging!
-        self._fp_write(EDROFF_PS)
-        self._fp_write(VDI_PS)
-        self._fp_write("%%EndProlog\n")
+        # self.fp.write(ERROR_PS)  # debugging!
+        self.fp.write(EDROFF_PS)
+        self.fp.write(VDI_PS)
+        self.fp.write(b"%%EndProlog\n")
         self.isofont = {}
 
     def end_document(self):
         """Ends printing. (Write PostScript DSC footer.)"""
-        self._fp_write("%%EndDocument\nrestore showpage\n%%End\n")
+        self.fp.write(b"%%EndDocument\nrestore showpage\n%%End\n")
         if hasattr(self.fp, "flush"):
             self.fp.flush()
 
@@ -69,12 +63,13 @@ class PSDraw:
         :param font: A PostScript font name
         :param size: Size in points.
         """
+        font = bytes(font, "UTF-8")
         if font not in self.isofont:
             # reencode font
-            self._fp_write(f"/PSDraw-{font} ISOLatin1Encoding /{font} E\n")
+            self.fp.write(b"/PSDraw-%s ISOLatin1Encoding /%s E\n" % (font, font))
             self.isofont[font] = 1
         # rough
-        self._fp_write(f"/F0 {size} /PSDraw-{font} F\n")
+        self.fp.write(b"/F0 %d /PSDraw-%s F\n" % (size, font))
 
     def line(self, xy0, xy1):
         """
@@ -82,7 +77,7 @@ class PSDraw:
         PostScript point coordinates (72 points per inch, (0, 0) is the lower
         left corner of the page).
         """
-        self._fp_write("%d %d %d %d Vl\n" % (*xy0, *xy1))
+        self.fp.write(b"%d %d %d %d Vl\n" % (*xy0, *xy1))
 
     def rectangle(self, box):
         """
@@ -97,16 +92,18 @@ class PSDraw:
 
                         %d %d M %d %d 0 Vr\n
         """
-        self._fp_write("%d %d M %d %d 0 Vr\n" % box)
+        self.fp.write(b"%d %d M %d %d 0 Vr\n" % box)
 
     def text(self, xy, text):
         """
         Draws text at the given position. You must use
         :py:meth:`~PIL.PSDraw.PSDraw.setfont` before calling this method.
         """
-        text = "\\(".join(text.split("("))
-        text = "\\)".join(text.split(")"))
-        self._fp_write(f"{xy[0]} {xy[1]} M ({text}) S\n")
+        text = bytes(text, "UTF-8")
+        text = b"\\(".join(text.split(b"("))
+        text = b"\\)".join(text.split(b")"))
+        xy += (text,)
+        self.fp.write(b"%d %d M (%s) S\n" % xy)
 
     def image(self, box, im, dpi=None):
         """Draw a PIL image, centered in the given box."""
@@ -130,14 +127,14 @@ class PSDraw:
             y = ymax
         dx = (xmax - x) / 2 + box[0]
         dy = (ymax - y) / 2 + box[1]
-        self._fp_write(f"gsave\n{dx:f} {dy:f} translate\n")
+        self.fp.write(b"gsave\n%f %f translate\n" % (dx, dy))
         if (x, y) != im.size:
             # EpsImagePlugin._save prints the image at (0,0,xsize,ysize)
             sx = x / im.size[0]
             sy = y / im.size[1]
-            self._fp_write(f"{sx:f} {sy:f} scale\n")
+            self.fp.write(b"%f %f scale\n" % (sx, sy))
         EpsImagePlugin._save(im, self.fp, None, 0)
-        self._fp_write("\ngrestore\n")
+        self.fp.write(b"\ngrestore\n")
 
 
 # --------------------------------------------------------------------
@@ -153,7 +150,7 @@ class PSDraw:
 #
 
 
-EDROFF_PS = """\
+EDROFF_PS = b"""\
 /S { show } bind def
 /P { moveto show } bind def
 /M { moveto } bind def
@@ -182,7 +179,7 @@ EDROFF_PS = """\
 # Copyright (c) Fredrik Lundh 1994.
 #
 
-VDI_PS = """\
+VDI_PS = b"""\
 /Vm { moveto } bind def
 /Va { newpath arcn stroke } bind def
 /Vl { moveto lineto stroke } bind def
@@ -207,7 +204,7 @@ VDI_PS = """\
 # 89-11-21 fl: created (pslist 1.10)
 #
 
-ERROR_PS = """\
+ERROR_PS = b"""\
 /landscape false def
 /errorBUF 200 string def
 /errorNL { currentpoint 10 sub exch pop 72 exch moveto } def