diff --git a/src/PIL/BmpImagePlugin.py b/src/PIL/BmpImagePlugin.py
index 85e2350c5..7bd5a0308 100644
--- a/src/PIL/BmpImagePlugin.py
+++ b/src/PIL/BmpImagePlugin.py
@@ -263,7 +263,7 @@ class BmpImageFile(ImageFile.ImageFile):
         # read 14 bytes: magic number, filesize, reserved, header final offset
         head_data = self.fp.read(14)
         # choke if the file does not have the required magic bytes
-        if head_data[0:2] != b"BM":
+        if not _accept(head_data):
             raise SyntaxError("Not a BMP file")
         # read the start position of the BMP image data (u32)
         offset = i32(head_data[10:14])
diff --git a/src/PIL/DcxImagePlugin.py b/src/PIL/DcxImagePlugin.py
index a12d9195b..de21db8f0 100644
--- a/src/PIL/DcxImagePlugin.py
+++ b/src/PIL/DcxImagePlugin.py
@@ -46,7 +46,7 @@ class DcxImageFile(PcxImageFile):
 
         # Header
         s = self.fp.read(4)
-        if i32(s) != MAGIC:
+        if not _accept(s):
             raise SyntaxError("not a DCX file")
 
         # Component directory
diff --git a/src/PIL/FliImagePlugin.py b/src/PIL/FliImagePlugin.py
index 989094569..f09d62ce3 100644
--- a/src/PIL/FliImagePlugin.py
+++ b/src/PIL/FliImagePlugin.py
@@ -42,9 +42,8 @@ class FliImageFile(ImageFile.ImageFile):
 
         # HEAD
         s = self.fp.read(128)
-        magic = i16(s[4:6])
         if not (
-            magic in [0xAF11, 0xAF12]
+            _accept(s)
             and i16(s[14:16]) in [0, 3]  # flags
             and s[20:22] == b"\x00\x00"  # reserved
         ):
@@ -60,6 +59,7 @@ class FliImageFile(ImageFile.ImageFile):
 
         # animation speed
         duration = i32(s[16:20])
+        magic = i16(s[4:6])
         if magic == 0xAF11:
             duration = (duration * 1000) // 70
         self.info["duration"] = duration
diff --git a/src/PIL/GifImagePlugin.py b/src/PIL/GifImagePlugin.py
index 9d360beae..6fd6182ab 100644
--- a/src/PIL/GifImagePlugin.py
+++ b/src/PIL/GifImagePlugin.py
@@ -63,7 +63,7 @@ class GifImageFile(ImageFile.ImageFile):
 
         # Screen
         s = self.fp.read(13)
-        if s[:6] not in [b"GIF87a", b"GIF89a"]:
+        if not _accept(s):
             raise SyntaxError("not a GIF file")
 
         self.info["version"] = s[:6]
diff --git a/src/PIL/JpegImagePlugin.py b/src/PIL/JpegImagePlugin.py
index 6edaee795..f846569b2 100644
--- a/src/PIL/JpegImagePlugin.py
+++ b/src/PIL/JpegImagePlugin.py
@@ -340,7 +340,7 @@ class JpegImageFile(ImageFile.ImageFile):
 
         s = self.fp.read(3)
 
-        if s != b"\xFF\xD8\xFF":
+        if not _accept(s):
             raise SyntaxError("not a JPEG file")
         s = b"\xFF"
 
diff --git a/src/PIL/MspImagePlugin.py b/src/PIL/MspImagePlugin.py
index 2b2937ecf..26acdd898 100644
--- a/src/PIL/MspImagePlugin.py
+++ b/src/PIL/MspImagePlugin.py
@@ -51,7 +51,7 @@ class MspImageFile(ImageFile.ImageFile):
 
         # Header
         s = self.fp.read(32)
-        if s[:4] not in [b"DanM", b"LinS"]:
+        if not _accept(s):
             raise SyntaxError("not an MSP file")
 
         # Header checksum
diff --git a/src/PIL/PixarImagePlugin.py b/src/PIL/PixarImagePlugin.py
index 5ea32ba89..91f0314b5 100644
--- a/src/PIL/PixarImagePlugin.py
+++ b/src/PIL/PixarImagePlugin.py
@@ -43,7 +43,7 @@ class PixarImageFile(ImageFile.ImageFile):
 
         # assuming a 4-byte magic label
         s = self.fp.read(4)
-        if s != b"\200\350\000\000":
+        if not _accept(s):
             raise SyntaxError("not a PIXAR file")
 
         # read rest of header
diff --git a/src/PIL/PngImagePlugin.py b/src/PIL/PngImagePlugin.py
index f62bf8542..51b78c7de 100644
--- a/src/PIL/PngImagePlugin.py
+++ b/src/PIL/PngImagePlugin.py
@@ -633,7 +633,7 @@ class PngImageFile(ImageFile.ImageFile):
 
     def _open(self):
 
-        if self.fp.read(8) != _MAGIC:
+        if not _accept(self.fp.read(8)):
             raise SyntaxError("not a PNG file")
         self.__fp = self.fp
         self.__frame = 0
diff --git a/src/PIL/PsdImagePlugin.py b/src/PIL/PsdImagePlugin.py
index 044df443d..89e55a4ce 100644
--- a/src/PIL/PsdImagePlugin.py
+++ b/src/PIL/PsdImagePlugin.py
@@ -61,7 +61,7 @@ class PsdImageFile(ImageFile.ImageFile):
         # header
 
         s = read(26)
-        if s[:4] != b"8BPS" or i16(s[4:]) != 1:
+        if not _accept(s) or i16(s[4:]) != 1:
             raise SyntaxError("not a PSD file")
 
         psd_bits = i16(s[22:])
diff --git a/src/PIL/SgiImagePlugin.py b/src/PIL/SgiImagePlugin.py
index ddd3de379..ec9855e77 100644
--- a/src/PIL/SgiImagePlugin.py
+++ b/src/PIL/SgiImagePlugin.py
@@ -58,8 +58,7 @@ class SgiImageFile(ImageFile.ImageFile):
         headlen = 512
         s = self.fp.read(headlen)
 
-        # magic number : 474
-        if i16(s) != 474:
+        if not _accept(s):
             raise ValueError("Not an SGI image file")
 
         # compression : verbatim or RLE
diff --git a/src/PIL/SunImagePlugin.py b/src/PIL/SunImagePlugin.py
index fd7ca8a40..d99884293 100644
--- a/src/PIL/SunImagePlugin.py
+++ b/src/PIL/SunImagePlugin.py
@@ -53,7 +53,7 @@ class SunImageFile(ImageFile.ImageFile):
 
         # HEAD
         s = self.fp.read(32)
-        if i32(s) != 0x59A66A95:
+        if not _accept(s):
             raise SyntaxError("not an SUN raster file")
 
         offset = 32