Merge branch 'main' into hopper-lru-cache

.github/ISSUE_TEMPLATE/ISSUE_REPORT.md

@@ -48,6 +48,21 @@ Thank you.
 * Python: 
 * Pillow: 
 
+```text
+Please paste here the output of running:
+
+python3 -m PIL.report
+or
+python3 -m PIL --report
+
+Or the output of the following Python code:
+
+from PIL import report
+# or
+from PIL import features
+features.pilinfo(supported_formats=False)
+```
+
 <!--
 Please include **code** that reproduces the issue and whenever possible, an **image** that demonstrates the issue. Please upload images to GitHub, not to third-party file hosting sites. If necessary, add the image to a zip or tar archive.
 

.github/workflows/wheels-dependencies.sh

@@ -16,7 +16,7 @@ ARCHIVE_SDIR=pillow-depends-main
 
 # Package versions for fresh source builds
 FREETYPE_VERSION=2.13.2
-HARFBUZZ_VERSION=8.3.1
+HARFBUZZ_VERSION=8.4.0
 LIBPNG_VERSION=1.6.43
 JPEGTURBO_VERSION=3.0.2
 OPENJPEG_VERSION=2.5.2

.github/workflows/wheels.yml

@@ -5,6 +5,7 @@ on:
     paths:
       - ".ci/requirements-cibw.txt"
       - ".github/workflows/wheel*"
+      - "setup.py"
       - "wheels/*"
       - "winbuild/build_prepare.py"
       - "winbuild/fribidi.cmake"
@@ -14,6 +15,7 @@ on:
     paths:
       - ".ci/requirements-cibw.txt"
       - ".github/workflows/wheel*"
+      - "setup.py"
       - "wheels/*"
       - "winbuild/build_prepare.py"
       - "winbuild/fribidi.cmake"

CHANGES.rst

@@ -5,6 +5,15 @@ Changelog (Pillow)
 10.3.0 (unreleased)
 -------------------
 
+- Determine MPO size from markers, not EXIF data #7884
+  [radarhere]
+
+- Improved conversion from RGB to RGBa, LA and La #7888
+  [radarhere]
+
+- Support FITS images with GZIP_1 compression #7894
+  [radarhere]
+
 - Use I;16 mode for 9-bit JPEG 2000 images #7900
   [scaramallion, radarhere]
 

Tests/helper.py

@@ -267,8 +267,6 @@ def _cached_hopper(mode: str | None = None) -> Image.Image:
         return Image.open("Tests/images/hopper.ppm")
     if mode == "F":
         im = _cached_hopper("L").convert(mode)
-    elif mode[:4] == "I;16":
-        im = _cached_hopper("I").convert(mode)
     else:
         im = _cached_hopper().convert(mode)
     return im

Tests/test_features.py

@@ -117,9 +117,10 @@ def test_unsupported_module() -> None:
         features.version_module(module)
 
 
-def test_pilinfo() -> None:
+@pytest.mark.parametrize("supported_formats", (True, False))
+def test_pilinfo(supported_formats) -> None:
     buf = io.StringIO()
-    features.pilinfo(buf)
+    features.pilinfo(buf, supported_formats=supported_formats)
     out = buf.getvalue()
     lines = out.splitlines()
     assert lines[0] == "-" * 68
@@ -129,9 +130,15 @@ def test_pilinfo() -> None:
     while lines[0].startswith("    "):
         lines = lines[1:]
     assert lines[0] == "-" * 68
-    assert lines[1].startswith("Python modules loaded from ")
-    assert lines[2].startswith("Binary modules loaded from ")
-    assert lines[3] == "-" * 68
+    assert lines[1].startswith("Python executable is")
+    lines = lines[2:]
+    if lines[0].startswith("Environment Python files loaded from"):
+        lines = lines[1:]
+    assert lines[0].startswith("System Python files loaded from")
+    assert lines[1] == "-" * 68
+    assert lines[2].startswith("Python Pillow modules loaded from ")
+    assert lines[3].startswith("Binary Pillow modules loaded from ")
+    assert lines[4] == "-" * 68
     jpeg = (
         "\n"
         + "-" * 68
@@ -142,4 +149,4 @@ def test_pilinfo() -> None:
         + "-" * 68
         + "\n"
     )
-    assert jpeg in out
+    assert supported_formats == (jpeg in out)

Tests/test_file_fits.py

@@ -6,7 +6,7 @@ import pytest
 
 from PIL import FitsImagePlugin, Image
 
-from .helper import assert_image_equal, hopper
+from .helper import assert_image_equal, assert_image_equal_tofile, hopper
 
 TEST_FILE = "Tests/images/hopper.fits"
 
@@ -22,6 +22,11 @@ def test_open() -> None:
         assert_image_equal(im, hopper("L"))
 
 
+def test_gzip1() -> None:
+    with Image.open("Tests/images/m13_gzip.fits") as im:
+        assert_image_equal_tofile(im, "Tests/images/m13.fits")
+
+
 def test_invalid_file() -> None:
     # Arrange
     invalid_file = "Tests/images/flower.jpg"

Tests/test_file_mpo.py

@@ -93,7 +93,7 @@ def test_exif(test_file: str) -> None:
 
 def test_frame_size() -> None:
     # This image has been hexedited to contain a different size
-    # in the EXIF data of the second frame
+    # in the SOF marker of the second frame
     with Image.open("Tests/images/sugarshack_frame_size.mpo") as im:
         assert im.size == (640, 480)
 

Tests/test_image.py

@@ -33,36 +33,38 @@ from .helper import (
     skip_unless_feature,
 )
 
+# name, pixel size
+image_modes = (
+    ("1", 1),
+    ("L", 1),
+    ("LA", 4),
+    ("La", 4),
+    ("P", 1),
+    ("PA", 4),
+    ("F", 4),
+    ("I", 4),
+    ("I;16", 2),
+    ("I;16L", 2),
+    ("I;16B", 2),
+    ("I;16N", 2),
+    ("RGB", 4),
+    ("RGBA", 4),
+    ("RGBa", 4),
+    ("RGBX", 4),
+    ("BGR;15", 2),
+    ("BGR;16", 2),
+    ("BGR;24", 3),
+    ("CMYK", 4),
+    ("YCbCr", 4),
+    ("HSV", 4),
+    ("LAB", 4),
+)
+
+image_mode_names = [name for name, _ in image_modes]
+
 
 class TestImage:
-    @pytest.mark.parametrize(
-        "mode",
-        (
-            "1",
-            "P",
-            "PA",
-            "L",
-            "LA",
-            "La",
-            "F",
-            "I",
-            "I;16",
-            "I;16L",
-            "I;16B",
-            "I;16N",
-            "RGB",
-            "RGBX",
-            "RGBA",
-            "RGBa",
-            "BGR;15",
-            "BGR;16",
-            "BGR;24",
-            "CMYK",
-            "YCbCr",
-            "LAB",
-            "HSV",
-        ),
-    )
+    @pytest.mark.parametrize("mode", image_mode_names)
     def test_image_modes_success(self, mode: str) -> None:
         Image.new(mode, (1, 1))
 
@@ -1042,6 +1044,35 @@ class TestImage:
             assert im.fp is None
 
 
+class TestImageBytes:
+    @pytest.mark.parametrize("mode", image_mode_names)
+    def test_roundtrip_bytes_constructor(self, mode: str) -> None:
+        im = hopper(mode)
+        source_bytes = im.tobytes()
+
+        reloaded = Image.frombytes(mode, im.size, source_bytes)
+        assert reloaded.tobytes() == source_bytes
+
+    @pytest.mark.parametrize("mode", image_mode_names)
+    def test_roundtrip_bytes_method(self, mode: str) -> None:
+        im = hopper(mode)
+        source_bytes = im.tobytes()
+
+        reloaded = Image.new(mode, im.size)
+        reloaded.frombytes(source_bytes)
+        assert reloaded.tobytes() == source_bytes
+
+    @pytest.mark.parametrize(("mode", "pixelsize"), image_modes)
+    def test_getdata_putdata(self, mode: str, pixelsize: int) -> None:
+        im = Image.new(mode, (2, 2))
+        source_bytes = bytes(range(im.width * im.height * pixelsize))
+        im.frombytes(source_bytes)
+
+        reloaded = Image.new(mode, im.size)
+        reloaded.putdata(im.getdata())
+        assert_image_equal(im, reloaded)
+
+
 class MockEncoder(ImageFile.PyEncoder):
     pass
 

Tests/test_image_convert.py

@@ -183,6 +183,14 @@ def test_trns_RGB(tmp_path: Path) -> None:
     assert im_l.info["transparency"] == im_l.getpixel((0, 0))  # undone
     im_l.save(f)
 
+    im_la = im.convert("LA")
+    assert "transparency" not in im_la.info
+    im_la.save(f)
+
+    im_la = im.convert("La")
+    assert "transparency" not in im_la.info
+    assert im_la.getpixel((0, 0)) == (0, 0)
+
     im_p = im.convert("P")
     assert "transparency" in im_p.info
     im_p.save(f)
@@ -191,6 +199,10 @@ def test_trns_RGB(tmp_path: Path) -> None:
     assert "transparency" not in im_rgba.info
     im_rgba.save(f)
 
+    im_rgba = im.convert("RGBa")
+    assert "transparency" not in im_rgba.info
+    assert im_rgba.getpixel((0, 0)) == (0, 0, 0, 0)
+
     im_p = pytest.warns(UserWarning, im.convert, "P", palette=Image.Palette.ADAPTIVE)
     assert "transparency" not in im_p.info
     im_p.save(f)

Tests/test_main.py

@@ -4,9 +4,16 @@ import os
 import subprocess
 import sys
 
+import pytest
 
-def test_main() -> None:
-    out = subprocess.check_output([sys.executable, "-m", "PIL"]).decode("utf-8")
+
+@pytest.mark.parametrize(
+    "args, report",
+    ((["PIL"], False), (["PIL", "--report"], True), (["PIL.report"], True)),
+)
+def test_main(args, report) -> None:
+    args = [sys.executable, "-m"] + args
+    out = subprocess.check_output(args).decode("utf-8")
     lines = out.splitlines()
     assert lines[0] == "-" * 68
     assert lines[1].startswith("Pillow ")
@@ -15,9 +22,15 @@ def test_main() -> None:
     while lines[0].startswith("    "):
         lines = lines[1:]
     assert lines[0] == "-" * 68
-    assert lines[1].startswith("Python modules loaded from ")
-    assert lines[2].startswith("Binary modules loaded from ")
-    assert lines[3] == "-" * 68
+    assert lines[1].startswith("Python executable is")
+    lines = lines[2:]
+    if lines[0].startswith("Environment Python files loaded from"):
+        lines = lines[1:]
+    assert lines[0].startswith("System Python files loaded from")
+    assert lines[1] == "-" * 68
+    assert lines[2].startswith("Python Pillow modules loaded from ")
+    assert lines[3].startswith("Binary Pillow modules loaded from ")
+    assert lines[4] == "-" * 68
     jpeg = (
         os.linesep
         + "-" * 68
@@ -31,4 +44,4 @@ def test_main() -> None:
         + "-" * 68
         + os.linesep
     )
-    assert jpeg in out
+    assert report == (jpeg not in out)

_custom_build/backend.py

@@ -11,41 +11,12 @@ backend_class = build_wheel.__self__.__class__
 class _CustomBuildMetaBackend(backend_class):
     def run_setup(self, setup_script="setup.py"):
         if self.config_settings:
+            for key, values in self.config_settings.items():
+                if not isinstance(values, list):
+                    values = [values]
+                for value in values:
+                    sys.argv.append(f"--pillow-configuration={key}={value}")
 
-            def config_has(key, value):
-                settings = self.config_settings.get(key)
-                if settings:
-                    if not isinstance(settings, list):
-                        settings = [settings]
-                    return value in settings
-
-            flags = []
-            for dependency in (
-                "zlib",
-                "jpeg",
-                "tiff",
-                "freetype",
-                "raqm",
-                "lcms",
-                "webp",
-                "webpmux",
-                "jpeg2000",
-                "imagequant",
-                "xcb",
-            ):
-                if config_has(dependency, "enable"):
-                    flags.append("--enable-" + dependency)
-                elif config_has(dependency, "disable"):
-                    flags.append("--disable-" + dependency)
-            for dependency in ("raqm", "fribidi"):
-                if config_has(dependency, "vendor"):
-                    flags.append("--vendor-" + dependency)
-            if self.config_settings.get("platform-guessing") == "disable":
-                flags.append("--disable-platform-guessing")
-            if self.config_settings.get("debug") == "true":
-                flags.append("--debug")
-            if flags:
-                sys.argv = sys.argv[:1] + ["build_ext"] + flags + sys.argv[1:]
         return super().run_setup(setup_script)
 
     def build_wheel(
@@ -54,5 +25,15 @@ class _CustomBuildMetaBackend(backend_class):
         self.config_settings = config_settings
         return super().build_wheel(wheel_directory, config_settings, metadata_directory)
 
+    def build_editable(
+        self, wheel_directory, config_settings=None, metadata_directory=None
+    ):
+        self.config_settings = config_settings
+        return super().build_editable(
+            wheel_directory, config_settings, metadata_directory
+        )
 
-build_wheel = _CustomBuildMetaBackend().build_wheel
+
+_backend = _CustomBuildMetaBackend()
+build_wheel = _backend.build_wheel
+build_editable = _backend.build_editable

docs/handbook/image-file-formats.rst

@@ -1339,7 +1339,8 @@ FITS
 
 .. versionadded:: 9.1.0
 
-Pillow identifies and reads FITS files, commonly used for astronomy.
+Pillow identifies and reads FITS files, commonly used for astronomy. Uncompressed and
+GZIP_1 compressed images can be read.
 
 FLI, FLC
 ^^^^^^^^

docs/installation/building-from-source.rst

@@ -266,9 +266,10 @@ After navigating to the Pillow directory, run::
 Build Options
 ^^^^^^^^^^^^^
 
-* Environment variable: ``MAX_CONCURRENCY=n``. Pillow can use
-  multiprocessing to build the extension. Setting ``MAX_CONCURRENCY``
-  sets the number of CPUs to use, or can disable parallel building by
+* Config setting: ``-C parallel=n``. Can also be given
+  with environment variable: ``MAX_CONCURRENCY=n``. Pillow can use
+  multiprocessing to build the extension. Setting ``-C parallel=n``
+  sets the number of CPUs to use to ``n``, or can disable parallel building by
   using a setting of 1. By default, it uses 4 CPUs, or if 4 are not
   available, as many as are present.
 
@@ -293,14 +294,13 @@ Build Options
   used to compile the standard Pillow wheels. Compiling libraqm requires
   a C99-compliant compiler.
 
-* Build flag: ``-C platform-guessing=disable``. Skips all of the
+* Config setting: ``-C platform-guessing=disable``. Skips all of the
   platform dependent guessing of include and library directories for
   automated build systems that configure the proper paths in the
   environment variables (e.g. Buildroot).
 
-* Build flag: ``-C debug=true``. Adds a debugging flag to the include and
-  library search process to dump all paths searched for and found to
-  stdout.
+* Config setting: ``-C debug=true``. Adds a debugging flag to the include and
+  library search process to dump all paths searched for and found to stdout.
 
 
 Sample usage::

setup.py

@@ -27,6 +27,9 @@ def get_version():
     return locals()["__version__"]
 
 
+configuration = {}
+
+
 PILLOW_VERSION = get_version()
 FREETYPE_ROOT = None
 HARFBUZZ_ROOT = None
@@ -333,15 +336,24 @@ class pil_build_ext(build_ext):
         + [("add-imaging-libs=", None, "Add libs to _imaging build")]
     )
 
+    @staticmethod
+    def check_configuration(option, value):
+        return True if value in configuration.get(option, []) else None
+
     def initialize_options(self):
-        self.disable_platform_guessing = None
+        self.disable_platform_guessing = self.check_configuration(
+            "platform-guessing", "disable"
+        )
         self.add_imaging_libs = ""
         build_ext.initialize_options(self)
         for x in self.feature:
-            setattr(self, f"disable_{x}", None)
-            setattr(self, f"enable_{x}", None)
+            setattr(self, f"disable_{x}", self.check_configuration(x, "disable"))
+            setattr(self, f"enable_{x}", self.check_configuration(x, "enable"))
         for x in ("raqm", "fribidi"):
-            setattr(self, f"vendor_{x}", None)
+            setattr(self, f"vendor_{x}", self.check_configuration(x, "vendor"))
+        if self.check_configuration("debug", "true"):
+            self.debug = True
+        self.parallel = configuration.get("parallel", [None])[-1]
 
     def finalize_options(self):
         build_ext.finalize_options(self)
@@ -987,6 +999,12 @@ ext_modules = [
     Extension("PIL._imagingmorph", ["src/_imagingmorph.c"]),
 ]
 
+
+# parse configuration from _custom_build/backend.py
+while sys.argv[-1].startswith("--pillow-configuration="):
+    _, key, value = sys.argv.pop().split("=", 2)
+    configuration.setdefault(key, []).append(value)
+
 try:
     setup(
         cmdclass={"build_ext": pil_build_ext},

src/PIL/FitsImagePlugin.py

@@ -10,6 +10,7 @@
 #
 from __future__ import annotations
 
+import gzip
 import math
 
 from . import Image, ImageFile
@@ -27,14 +28,32 @@ class FitsImageFile(ImageFile.ImageFile):
         assert self.fp is not None
 
         headers: dict[bytes, bytes] = {}
+        header_in_progress = False
+        decoder_name = ""
         while True:
             header = self.fp.read(80)
             if not header:
                 msg = "Truncated FITS file"
                 raise OSError(msg)
             keyword = header[:8].strip()
-            if keyword == b"END":
+            if keyword in (b"SIMPLE", b"XTENSION"):
+                header_in_progress = True
+            elif headers and not header_in_progress:
+                # This is now a data unit
                 break
+            elif keyword == b"END":
+                # Seek to the end of the header unit
+                self.fp.seek(math.ceil(self.fp.tell() / 2880) * 2880)
+                if not decoder_name:
+                    decoder_name, offset, args = self._parse_headers(headers)
+
+                header_in_progress = False
+                continue
+
+            if decoder_name:
+                # Keep going to read past the headers
+                continue
+
             value = header[8:].split(b"/")[0].strip()
             if value.startswith(b"="):
                 value = value[1:].strip()
@@ -43,32 +62,87 @@ class FitsImageFile(ImageFile.ImageFile):
                 raise SyntaxError(msg)
             headers[keyword] = value
 
-        naxis = int(headers[b"NAXIS"])
-        if naxis == 0:
+        if not decoder_name:
             msg = "No image data"
             raise ValueError(msg)
-        elif naxis == 1:
-            self._size = 1, int(headers[b"NAXIS1"])
-        else:
-            self._size = int(headers[b"NAXIS1"]), int(headers[b"NAXIS2"])
 
-        number_of_bits = int(headers[b"BITPIX"])
+        offset += self.fp.tell() - 80
+        self.tile = [(decoder_name, (0, 0) + self.size, offset, args)]
+
+    def _get_size(
+        self, headers: dict[bytes, bytes], prefix: bytes
+    ) -> tuple[int, int] | None:
+        naxis = int(headers[prefix + b"NAXIS"])
+        if naxis == 0:
+            return None
+
+        if naxis == 1:
+            return 1, int(headers[prefix + b"NAXIS1"])
+        else:
+            return int(headers[prefix + b"NAXIS1"]), int(headers[prefix + b"NAXIS2"])
+
+    def _parse_headers(
+        self, headers: dict[bytes, bytes]
+    ) -> tuple[str, int, tuple[str | int, ...]]:
+        prefix = b""
+        decoder_name = "raw"
+        offset = 0
+        if (
+            headers.get(b"XTENSION") == b"'BINTABLE'"
+            and headers.get(b"ZIMAGE") == b"T"
+            and headers[b"ZCMPTYPE"] == b"'GZIP_1  '"
+        ):
+            no_prefix_size = self._get_size(headers, prefix) or (0, 0)
+            number_of_bits = int(headers[b"BITPIX"])
+            offset = no_prefix_size[0] * no_prefix_size[1] * (number_of_bits // 8)
+
+            prefix = b"Z"
+            decoder_name = "fits_gzip"
+
+        size = self._get_size(headers, prefix)
+        if not size:
+            return "", 0, ()
+
+        self._size = size
+
+        number_of_bits = int(headers[prefix + b"BITPIX"])
         if number_of_bits == 8:
             self._mode = "L"
         elif number_of_bits == 16:
-            self._mode = "I"
+            self._mode = "I;16"
         elif number_of_bits == 32:
             self._mode = "I"
         elif number_of_bits in (-32, -64):
             self._mode = "F"
 
-        offset = math.ceil(self.fp.tell() / 2880) * 2880
-        self.tile = [("raw", (0, 0) + self.size, offset, (self.mode, 0, -1))]
+        args = (self.mode, 0, -1) if decoder_name == "raw" else (number_of_bits,)
+        return decoder_name, offset, args
+
+
+class FitsGzipDecoder(ImageFile.PyDecoder):
+    _pulls_fd = True
+
+    def decode(self, buffer):
+        assert self.fd is not None
+        value = gzip.decompress(self.fd.read())
+
+        rows = []
+        offset = 0
+        number_of_bits = min(self.args[0] // 8, 4)
+        for y in range(self.state.ysize):
+            row = bytearray()
+            for x in range(self.state.xsize):
+                row += value[offset + (4 - number_of_bits) : offset + 4]
+                offset += 4
+            rows.append(row)
+        self.set_as_raw(bytes([pixel for row in rows[::-1] for pixel in row]))
+        return -1, 0
 
 
 # --------------------------------------------------------------------
 # Registry
 
 Image.register_open(FitsImageFile.format, FitsImageFile, _accept)
+Image.register_decoder("fits_gzip", FitsGzipDecoder)
 
 Image.register_extensions(FitsImageFile.format, [".fit", ".fits"])

src/PIL/Image.py

@@ -978,7 +978,7 @@ class Image:
         # transparency handling
         if has_transparency:
             if (self.mode in ("1", "L", "I", "I;16") and mode in ("LA", "RGBA")) or (
-                self.mode == "RGB" and mode == "RGBA"
+                self.mode == "RGB" and mode in ("La", "LA", "RGBa", "RGBA")
             ):
                 # Use transparent conversion to promote from transparent
                 # color to an alpha channel.

src/PIL/MpoImagePlugin.py

@@ -24,14 +24,11 @@ import os
 import struct
 
 from . import (
-    ExifTags,
     Image,
-    ImageFile,
     ImageSequence,
     JpegImagePlugin,
     TiffImagePlugin,
 )
-from ._binary import i16be as i16
 from ._binary import o32le
 
 
@@ -109,7 +106,6 @@ class MpoImageFile(JpegImagePlugin.JpegImageFile):
         self._after_jpeg_open()
 
     def _after_jpeg_open(self, mpheader=None):
-        self._initial_size = self.size
         self.mpinfo = mpheader if mpheader is not None else self._getmp()
         self.n_frames = self.mpinfo[0xB001]
         self.__mpoffsets = [
@@ -137,27 +133,20 @@ class MpoImageFile(JpegImagePlugin.JpegImageFile):
         self.fp = self._fp
         self.offset = self.__mpoffsets[frame]
 
+        original_exif = self.info.get("exif")
+        if "exif" in self.info:
+            del self.info["exif"]
+
         self.fp.seek(self.offset + 2)  # skip SOI marker
-        segment = self.fp.read(2)
-        if not segment:
+        if not self.fp.read(2):
             msg = "No data found for frame"
             raise ValueError(msg)
-        self._size = self._initial_size
-        if i16(segment) == 0xFFE1:  # APP1
-            n = i16(self.fp.read(2)) - 2
-            self.info["exif"] = ImageFile._safe_read(self.fp, n)
+        self.fp.seek(self.offset)
+        JpegImagePlugin.JpegImageFile._open(self)
+        if self.info.get("exif") != original_exif:
             self._reload_exif()
 
-            mptype = self.mpinfo[0xB002][frame]["Attribute"]["MPType"]
-            if mptype.startswith("Large Thumbnail"):
-                exif = self.getexif().get_ifd(ExifTags.IFD.Exif)
-                if 40962 in exif and 40963 in exif:
-                    self._size = (exif[40962], exif[40963])
-        elif "exif" in self.info:
-            del self.info["exif"]
-            self._reload_exif()
-
-        self.tile = [("jpeg", (0, 0) + self.size, self.offset, (self.mode, ""))]
+        self.tile = [("jpeg", (0, 0) + self.size, self.offset, self.tile[0][-1])]
         self.__frame = frame
 
     def tell(self):

src/PIL/__main__.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import sys
+
 from .features import pilinfo
 
-pilinfo()
+pilinfo(supported_formats="--report" not in sys.argv)

src/PIL/features.py

@@ -230,6 +230,9 @@ def pilinfo(out=None, supported_formats=True):
     """
     Prints information about this installation of Pillow.
     This function can be called with ``python3 -m PIL``.
+    It can also be called with ``python3 -m PIL.report`` or ``python3 -m PIL --report``
+    to have "supported_formats" set to ``False``, omitting the list of all supported
+    image file formats.
 
     :param out:
         The output stream to print to. Defaults to ``sys.stdout`` if ``None``.
@@ -249,12 +252,17 @@ def pilinfo(out=None, supported_formats=True):
     for py_version in py_version[1:]:
         print(f"       {py_version.strip()}", file=out)
     print("-" * 68, file=out)
+    print(f"Python executable is {sys.executable or 'unknown'}", file=out)
+    if sys.prefix != sys.base_prefix:
+        print(f"Environment Python files loaded from {sys.prefix}", file=out)
+    print(f"System Python files loaded from {sys.base_prefix}", file=out)
+    print("-" * 68, file=out)
     print(
-        f"Python modules loaded from {os.path.dirname(Image.__file__)}",
+        f"Python Pillow modules loaded from {os.path.dirname(Image.__file__)}",
         file=out,
     )
     print(
-        f"Binary modules loaded from {os.path.dirname(Image.core.__file__)}",
+        f"Binary Pillow modules loaded from {os.path.dirname(Image.core.__file__)}",
         file=out,
     )
     print("-" * 68, file=out)

src/PIL/report.py

@@ -0,0 +1,5 @@
+from __future__ import annotations
+
+from .features import pilinfo
+
+pilinfo(supported_formats=False)

src/_imaging.c

@@ -1578,7 +1578,17 @@ if (PySequence_Check(op)) { \
                 int bigendian = 0;
                 if (image->type == IMAGING_TYPE_SPECIAL) {
                     // I;16*
-                    bigendian = strcmp(image->mode, "I;16B") == 0;
+                    if (strcmp(image->mode, "I;16N") == 0) {
+#ifdef WORDS_BIGENDIAN
+                        bigendian = 1;
+#else
+                        bigendian = 0;
+#endif
+                    } else if (strcmp(image->mode, "I;16B") == 0) {
+                        bigendian = 1;
+                    } else {
+                        bigendian = 0;
+                    }
                 }
                 for (i = x = y = 0; i < n; i++) {
                     set_value_to_item(seq, i);

src/libImaging/Convert.c

@@ -250,6 +250,26 @@ rgb2i(UINT8 *out_, const UINT8 *in, int xsize) {
     }
 }
 
+static void
+rgb2i16l(UINT8 *out_, const UINT8 *in, int xsize) {
+    int x;
+    for (x = 0; x < xsize; x++, in += 4) {
+        UINT8 v = CLIP16(L24(in) >> 16);
+        *out_++ = v;
+        *out_++ = v >> 8;
+    }
+}
+
+static void
+rgb2i16b(UINT8 *out_, const UINT8 *in, int xsize) {
+    int x;
+    for (x = 0; x < xsize; x++, in += 4) {
+        UINT8 v = CLIP16(L24(in) >> 16);
+        *out_++ = v >> 8;
+        *out_++ = v;
+    }
+}
+
 static void
 rgb2f(UINT8 *out_, const UINT8 *in, int xsize) {
     int x;
@@ -499,26 +519,27 @@ rgba2rgb_(UINT8 *out, const UINT8 *in, int xsize) {
 }
 
 /*
- * Conversion of RGB + single transparent color to RGBA,
- * where any pixel that matches the color will have the
- * alpha channel set to 0
+ * Conversion of RGB + single transparent color either to
+ * RGBA or LA, where any pixel matching the color will have the alpha channel set to 0, or
+ * RGBa or La, where any pixel matching the color will have all channels set to 0
  */
 
 static void
-rgbT2rgba(UINT8 *out, int xsize, int r, int g, int b) {
+rgbT2a(UINT8 *out, UINT8 *in, int xsize, int r, int g, int b, int premultiplied) {
 #ifdef WORDS_BIGENDIAN
     UINT32 trns = ((r & 0xff) << 24) | ((g & 0xff) << 16) | ((b & 0xff) << 8) | 0xff;
-    UINT32 repl = trns & 0xffffff00;
+    UINT32 repl = premultiplied ? 0 : (trns & 0xffffff00);
 #else
     UINT32 trns = (0xffU << 24) | ((b & 0xff) << 16) | ((g & 0xff) << 8) | (r & 0xff);
-    UINT32 repl = trns & 0x00ffffff;
+    UINT32 repl = premultiplied ? 0 : (trns & 0x00ffffff);
 #endif
 
     int i;
 
-    for (i = 0; i < xsize; i++, out += sizeof(trns)) {
+    UINT8 *ref = in != NULL ? in : out;
+    for (i = 0; i < xsize; i++, ref += sizeof(trns), out += sizeof(trns)) {
         UINT32 v;
-        memcpy(&v, out, sizeof(v));
+        memcpy(&v, ref, sizeof(v));
         if (v == trns) {
             memcpy(out, &repl, sizeof(repl));
         }
@@ -941,12 +962,17 @@ static struct {
     {"RGB", "1", rgb2bit},
     {"RGB", "L", rgb2l},
     {"RGB", "LA", rgb2la},
+    {"RGB", "La", rgb2la},
     {"RGB", "I", rgb2i},
+    {"RGB", "I;16", rgb2i16l},
+    {"RGB", "I;16L", rgb2i16l},
+    {"RGB", "I;16B", rgb2i16b},
     {"RGB", "F", rgb2f},
     {"RGB", "BGR;15", rgb2bgr15},
     {"RGB", "BGR;16", rgb2bgr16},
     {"RGB", "BGR;24", rgb2bgr24},
     {"RGB", "RGBA", rgb2rgba},
+    {"RGB", "RGBa", rgb2rgba},
     {"RGB", "RGBX", rgb2rgba},
     {"RGB", "CMYK", rgb2cmyk},
     {"RGB", "YCbCr", ImagingConvertRGB2YCbCr},
@@ -1681,14 +1707,27 @@ ImagingConvertTransparent(Imaging imIn, const char *mode, int r, int g, int b) {
     ImagingSectionCookie cookie;
     ImagingShuffler convert;
     Imaging imOut = NULL;
+    int premultiplied = 0;
+    // If the transparency matches pixels in the source image, not the converted image
+    UINT8 *source;
+    int source_transparency = 0;
     int y;
 
     if (!imIn) {
         return (Imaging)ImagingError_ModeError();
     }
 
-    if (strcmp(imIn->mode, "RGB") == 0 && strcmp(mode, "RGBA") == 0) {
+    if (strcmp(imIn->mode, "RGB") == 0 && (strcmp(mode, "RGBA") == 0 || strcmp(mode, "RGBa") == 0)) {
         convert = rgb2rgba;
+        if (strcmp(mode, "RGBa") == 0) {
+            premultiplied = 1;
+        }
+    } else if (strcmp(imIn->mode, "RGB") == 0 && (strcmp(mode, "LA") == 0 || strcmp(mode, "La") == 0)) {
+        convert = rgb2la;
+        source_transparency = 1;
+        if (strcmp(mode, "La") == 0) {
+            premultiplied = 1;
+        }
     } else if ((strcmp(imIn->mode, "1") == 0 ||
                 strcmp(imIn->mode, "I") == 0 ||
                 strcmp(imIn->mode, "I;16") == 0 ||
@@ -1726,7 +1765,9 @@ ImagingConvertTransparent(Imaging imIn, const char *mode, int r, int g, int b) {
     ImagingSectionEnter(&cookie);
     for (y = 0; y < imIn->ysize; y++) {
         (*convert)((UINT8 *)imOut->image[y], (UINT8 *)imIn->image[y], imIn->xsize);
-        rgbT2rgba((UINT8 *)imOut->image[y], imIn->xsize, r, g, b);
+
+        source = source_transparency ? (UINT8 *)imIn->image[y] : NULL;
+        rgbT2a((UINT8 *)imOut->image[y], source, imIn->xsize, r, g, b, premultiplied);
     }
     ImagingSectionLeave(&cookie);
 

winbuild/build.rst

@@ -87,11 +87,18 @@ are set by running ``winbuild\build\build_env.cmd`` and install Pillow with pip:
     winbuild\build\build_env.cmd
     python.exe -m pip install -v -C raqm=vendor -C fribidi=vendor .
 
-To build a wheel instead, run::
+You can also install Pillow in `editable mode`_::
+
+    winbuild\build\build_env.cmd
+    python.exe -m pip install -v -C raqm=vendor -C fribidi=vendor -e .
+
+To build a binary wheel instead, run::
 
     winbuild\build\build_env.cmd
     python.exe -m pip wheel -v -C raqm=vendor -C fribidi=vendor .
 
+.. _editable mode: https://setuptools.pypa.io/en/stable/userguide/development_mode.html
+
 Testing Pillow
 --------------
 

winbuild/build_prepare.py

@@ -113,7 +113,7 @@ V = {
     "BROTLI": "1.1.0",
     "FREETYPE": "2.13.2",
     "FRIBIDI": "1.0.13",
-    "HARFBUZZ": "8.3.1",
+    "HARFBUZZ": "8.4.0",
     "JPEGTURBO": "3.0.2",
     "LCMS2": "2.16",
     "LIBPNG": "1.6.43",