Fix Pillow deprecation warnings

src/ocrmypdf/_exec/ghostscript.py

@@ -24,6 +24,15 @@ from ocrmypdf.exceptions import MissingDependencyError, SubprocessOutputError
 from ocrmypdf.helpers import Resolution
 from ocrmypdf.subprocess import get_version, run, run_polling_stderr
 
+try:
+    ROTATE_90 = Image.Transpose.ROTATE_90
+    ROTATE_180 = Image.Transpose.ROTATE_180
+    ROTATE_270 = Image.Transpose.ROTATE_270
+except AttributeError:
+    ROTATE_90 = Image.ROTATE_90
+    ROTATE_180 = Image.ROTATE_180
+    ROTATE_270 = Image.ROTATE_270
+
 log = logging.getLogger(__name__)
 
 missing_gs_error = """
@@ -132,11 +141,11 @@ def rasterize_pdf(
                 # rotation is a clockwise angle and Image.ROTATE_* is
                 # counterclockwise so this cancels out the rotation
                 if rotation == 90:
-                    im = im.transpose(Image.ROTATE_90)
+                    im = im.transpose(ROTATE_90)
                 elif rotation == 180:
-                    im = im.transpose(Image.ROTATE_180)
+                    im = im.transpose(ROTATE_180)
                 elif rotation == 270:
-                    im = im.transpose(Image.ROTATE_270)
+                    im = im.transpose(ROTATE_270)
                 if rotation % 180 == 90:
                     page_dpi = page_dpi.flip_axis()
             im.save(fspath(output_file), dpi=page_dpi)

src/ocrmypdf/_pipeline.py

@@ -38,6 +38,11 @@ from ocrmypdf.optimize import optimize
 from ocrmypdf.pdfa import generate_pdfa_ps
 from ocrmypdf.pdfinfo import Colorspace, Encoding, PdfInfo
 
+try:
+    BICUBIC = Image.Resampling.BICUBIC
+except AttributeError:
+    BICUBIC = Image.BICUBIC
+
 log = logging.getLogger(__name__)
 
 VECTOR_PAGE_DPI = 400
@@ -484,7 +489,7 @@ def preprocess_deskew(input_file: Path, page_context: PageContext):
         # According to Pillow docs, .rotate() will automatically use Image.NEAREST
         # resampling if image is mode '1' or 'P'
         deskewed = im.rotate(
-            deskew_angle_degrees, resample=Image.BICUBIC, fillcolor='white'
+            deskew_angle_degrees, resample=BICUBIC, fillcolor='white'
         )
         deskewed.save(output_file, dpi=dpi)