Use '--psm' instead of '-psm' as the option was deprecated.

This recently changed in the official tesseract engine [0]. '-psm' is not
allowed as an option anymore and '--psm' has to be used instead.

[0] tesseract-ocr/tesseract@ee201e1

src/pyocr/builders.py

@@ -305,7 +305,7 @@ class TextBuilder(BaseBuilder):
     def __init__(self, tesseract_layout=3, cuneiform_dotmatrix=False,
                  cuneiform_fax=False, cuneiform_singlecolumn=False):
         file_ext = ["txt"]
-        tess_flags = ["-psm", str(tesseract_layout)]
+        tess_flags = ["--psm", str(tesseract_layout)]
         cun_args = ["-f", "text"]
         # Add custom cuneiform parameters if needed
         for par, arg in [(cuneiform_dotmatrix, "--dotmatrix"),
@@ -562,7 +562,7 @@ class WordBoxBuilder(BaseBuilder):
 
     def __init__(self, tesseract_layout=1):
         file_ext = ["html", "hocr"]
-        tess_flags = ["-psm", str(tesseract_layout)]
+        tess_flags = ["--psm", str(tesseract_layout)]
         tess_conf = ["hocr"]
         cun_args = ["-f", "hocr"]
         super(WordBoxBuilder, self).__init__(file_ext, tess_flags, tess_conf,
@@ -638,7 +638,7 @@ class LineBoxBuilder(BaseBuilder):
 
     def __init__(self, tesseract_layout=1):
         file_ext = ["html", "hocr"]
-        tess_flags = ["-psm", str(tesseract_layout)]
+        tess_flags = ["--psm", str(tesseract_layout)]
         tess_conf = ["hocr"]
         cun_args = ["-f", "hocr"]
         super(LineBoxBuilder, self).__init__(file_ext, tess_flags, tess_conf,

src/pyocr/tesseract.py

@@ -178,7 +178,7 @@ def detect_orientation(image, lang=None):
     """
     _set_environment()
     with temp_dir() as tmpdir:
-        command = [TESSERACT_CMD, "input.bmp", 'stdout', "-psm", "0"]
+        command = [TESSERACT_CMD, "input.bmp", 'stdout', "--psm", "0"]
         version = get_version()
         if version[0] >= 4:
             # XXX: temporary fix to remove once Tesseract 4 is stable