diff --git a/Tests/test_image_resize.py b/Tests/test_image_resize.py index d9ddf5009..8548fb5da 100644 --- a/Tests/test_image_resize.py +++ b/Tests/test_image_resize.py @@ -44,9 +44,19 @@ class TestImagingCoreResize: self.resize(hopper("1"), (15, 12), Image.Resampling.BILINEAR) with pytest.raises(ValueError): self.resize(hopper("P"), (15, 12), Image.Resampling.BILINEAR) - with pytest.raises(ValueError): - self.resize(hopper("I;16"), (15, 12), Image.Resampling.BILINEAR) - for mode in ["L", "I", "F", "RGB", "RGBA", "CMYK", "YCbCr"]: + for mode in [ + "L", + "I", + "I;16", + "I;16L", + "I;16B", + "I;16N", + "F", + "RGB", + "RGBA", + "CMYK", + "YCbCr", + ]: im = hopper(mode) r = self.resize(im, (15, 12), Image.Resampling.BILINEAR) assert r.mode == mode @@ -305,14 +315,14 @@ class TestImageResize: im = im.resize((64, 64)) assert im.size == (64, 64) - @pytest.mark.parametrize("mode", ("L", "RGB", "I", "F")) + @pytest.mark.parametrize( + "mode", ("L", "RGB", "I", "I;16", "I;16L", "I;16B", "I;16N", "F") + ) def test_default_filter_bicubic(self, mode: str) -> None: im = hopper(mode) assert im.resize((20, 20), Image.Resampling.BICUBIC) == im.resize((20, 20)) - @pytest.mark.parametrize( - "mode", ("1", "P", "I;16", "I;16L", "I;16B", "BGR;15", "BGR;16") - ) + @pytest.mark.parametrize("mode", ("1", "P", "BGR;15", "BGR;16")) def test_default_filter_nearest(self, mode: str) -> None: im = hopper(mode) assert im.resize((20, 20), Image.Resampling.NEAREST) == im.resize((20, 20)) diff --git a/docs/releasenotes/11.0.0.rst b/docs/releasenotes/11.0.0.rst index 36334e39f..1218c5014 100644 --- a/docs/releasenotes/11.0.0.rst +++ b/docs/releasenotes/11.0.0.rst @@ -119,10 +119,11 @@ Specific WebP Feature Checks API Changes =========== -TODO -^^^^ +Default resampling filter for I;16* image modes +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -TODO +The default resampling filter for I;16, I;16L, I;16B and I;16N has been changed from +``Image.NEAREST`` to ``Image.BICUBIC``, to match the majority of modes. API Additions ============= diff --git a/src/PIL/Image.py b/src/PIL/Image.py index 3f94cef38..bf9079f8b 100644 --- a/src/PIL/Image.py +++ b/src/PIL/Image.py @@ -2278,8 +2278,8 @@ class Image: :py:data:`Resampling.BILINEAR`, :py:data:`Resampling.HAMMING`, :py:data:`Resampling.BICUBIC` or :py:data:`Resampling.LANCZOS`. If the image has mode "1" or "P", it is always set to - :py:data:`Resampling.NEAREST`. If the image mode specifies a number - of bits, such as "I;16", then the default filter is + :py:data:`Resampling.NEAREST`. If the image mode is "BGR;15", + "BGR;16" or "BGR;24", then the default filter is :py:data:`Resampling.NEAREST`. Otherwise, the default filter is :py:data:`Resampling.BICUBIC`. See: :ref:`concept-filters`. :param box: An optional 4-tuple of floats providing @@ -2302,8 +2302,8 @@ class Image: """ if resample is None: - type_special = ";" in self.mode - resample = Resampling.NEAREST if type_special else Resampling.BICUBIC + bgr = self.mode.startswith("BGR;") + resample = Resampling.NEAREST if bgr else Resampling.BICUBIC elif resample not in ( Resampling.NEAREST, Resampling.BILINEAR, diff --git a/src/_imaging.c b/src/_imaging.c index 07d9a64cc..426036335 100644 --- a/src/_imaging.c +++ b/src/_imaging.c @@ -1579,16 +1579,12 @@ _putdata(ImagingObject *self, PyObject *args) { int bigendian = 0; if (image->type == IMAGING_TYPE_SPECIAL) { // I;16* - if (strcmp(image->mode, "I;16N") == 0) { + if (strcmp(image->mode, "I;16B") == 0 #ifdef WORDS_BIGENDIAN - bigendian = 1; -#else - bigendian = 0; + || strcmp(image->mode, "I;16N") == 0 #endif - } else if (strcmp(image->mode, "I;16B") == 0) { + ) { bigendian = 1; - } else { - bigendian = 0; } } for (i = x = y = 0; i < n; i++) { diff --git a/src/libImaging/Resample.c b/src/libImaging/Resample.c index 222d6bca4..f5e386dc2 100644 --- a/src/libImaging/Resample.c +++ b/src/libImaging/Resample.c @@ -460,6 +460,83 @@ ImagingResampleVertical_8bpc( ImagingSectionLeave(&cookie); } +void +ImagingResampleHorizontal_16bpc( + Imaging imOut, Imaging imIn, int offset, int ksize, int *bounds, double *kk +) { + ImagingSectionCookie cookie; + double ss; + int xx, yy, x, xmin, xmax, ss_int; + double *k; + + int bigendian = 0; + if (strcmp(imIn->mode, "I;16N") == 0 +#ifdef WORDS_BIGENDIAN + || strcmp(imIn->mode, "I;16B") == 0 +#endif + ) { + bigendian = 1; + } + + ImagingSectionEnter(&cookie); + for (yy = 0; yy < imOut->ysize; yy++) { + for (xx = 0; xx < imOut->xsize; xx++) { + xmin = bounds[xx * 2 + 0]; + xmax = bounds[xx * 2 + 1]; + k = &kk[xx * ksize]; + ss = 0.0; + for (x = 0; x < xmax; x++) { + ss += (imIn->image8[yy + offset][(x + xmin) * 2 + (bigendian ? 1 : 0)] + + (imIn->image8[yy + offset][(x + xmin) * 2 + (bigendian ? 0 : 1)] + << 8)) * + k[x]; + } + ss_int = ROUND_UP(ss); + imOut->image8[yy][xx * 2 + (bigendian ? 1 : 0)] = CLIP8(ss_int % 256); + imOut->image8[yy][xx * 2 + (bigendian ? 0 : 1)] = CLIP8(ss_int >> 8); + } + } + ImagingSectionLeave(&cookie); +} + +void +ImagingResampleVertical_16bpc( + Imaging imOut, Imaging imIn, int offset, int ksize, int *bounds, double *kk +) { + ImagingSectionCookie cookie; + double ss; + int xx, yy, y, ymin, ymax, ss_int; + double *k; + + int bigendian = 0; + if (strcmp(imIn->mode, "I;16N") == 0 +#ifdef WORDS_BIGENDIAN + || strcmp(imIn->mode, "I;16B") == 0 +#endif + ) { + bigendian = 1; + } + + ImagingSectionEnter(&cookie); + for (yy = 0; yy < imOut->ysize; yy++) { + ymin = bounds[yy * 2 + 0]; + ymax = bounds[yy * 2 + 1]; + k = &kk[yy * ksize]; + for (xx = 0; xx < imOut->xsize; xx++) { + ss = 0.0; + for (y = 0; y < ymax; y++) { + ss += (imIn->image8[y + ymin][xx * 2 + (bigendian ? 1 : 0)] + + (imIn->image8[y + ymin][xx * 2 + (bigendian ? 0 : 1)] << 8)) * + k[y]; + } + ss_int = ROUND_UP(ss); + imOut->image8[yy][xx * 2 + (bigendian ? 1 : 0)] = CLIP8(ss_int % 256); + imOut->image8[yy][xx * 2 + (bigendian ? 0 : 1)] = CLIP8(ss_int >> 8); + } + } + ImagingSectionLeave(&cookie); +} + void ImagingResampleHorizontal_32bpc( Imaging imOut, Imaging imIn, int offset, int ksize, int *bounds, double *kk @@ -574,7 +651,12 @@ ImagingResample(Imaging imIn, int xsize, int ysize, int filter, float box[4]) { } if (imIn->type == IMAGING_TYPE_SPECIAL) { - return (Imaging)ImagingError_ModeError(); + if (strncmp(imIn->mode, "I;16", 4) == 0) { + ResampleHorizontal = ImagingResampleHorizontal_16bpc; + ResampleVertical = ImagingResampleVertical_16bpc; + } else { + return (Imaging)ImagingError_ModeError(); + } } else if (imIn->image8) { ResampleHorizontal = ImagingResampleHorizontal_8bpc; ResampleVertical = ImagingResampleVertical_8bpc;