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only use TIFFReadRGBA* in case of o_jpeg compression

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This commit is contained in:
Konstantin Kopachev 2021-01-09 15:05:36 -08:00 committed by Eric Soroos
parent f2020eeab4
commit 169bb4842f
3 changed files with 19 additions and 5 deletions
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4
Tests/test_file_libtiff.py
View File

@ -824,14 +824,12 @@ class TestFileLibTiff(LibTiffTestCase):
assert_image_similar_tofile(im, "Tests/images/pil_sample_cmyk.jpg", 0.5)
@pytest.mark.valgrind_known_error(reason="Known Failing")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_strip_ycbcr_jpeg_2x2_sampling(self):
infile = "Tests/images/tiff_strip_ycbcr_jpeg_2x2_sampling.tif"
with Image.open(infile) as im:
assert_image_similar_tofile(im, "Tests/images/flower.jpg", 0.5)
@pytest.mark.valgrind_known_error(reason="Known Failing")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_strip_ycbcr_jpeg_1x1_sampling(self):
infile = "Tests/images/tiff_strip_ycbcr_jpeg_1x1_sampling.tif"
with Image.open(infile) as im:
@ -843,14 +841,12 @@ class TestFileLibTiff(LibTiffTestCase):
assert_image_similar_tofile(im, "Tests/images/pil_sample_cmyk.jpg", 0.5)
@pytest.mark.valgrind_known_error(reason="Known Failing")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_tiled_ycbcr_jpeg_1x1_sampling(self):
infile = "Tests/images/tiff_tiled_ycbcr_jpeg_1x1_sampling.tif"
with Image.open(infile) as im:
assert_image_equal_tofile(im, "Tests/images/flower2.jpg")
@pytest.mark.valgrind_known_error(reason="Known Failing")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_tiled_ycbcr_jpeg_2x2_sampling(self):
infile = "Tests/images/tiff_tiled_ycbcr_jpeg_2x2_sampling.tif"
with Image.open(infile) as im:

9
src/PIL/TiffImagePlugin.py
View File

@ -1324,6 +1324,15 @@ class TiffImageFile(ImageFile.ImageFile):
if ";16L" in rawmode:
rawmode = rawmode.replace(";16L", ";16N")
# YCbCr images with new jpeg compression with pixels in one plane
# unpacked straight into RGB values
if (
photo == 6
and self._compression == "jpeg"
and self._planar_configuration == 1
):
rawmode = "RGB"
# Offset in the tile tuple is 0, we go from 0,0 to
# w,h, and we only do this once -- eds
a = (rawmode, self._compression, False, self.tag_v2.offset)

11
src/libImaging/TiffDecode.c
View File

@ -407,6 +407,7 @@ ImagingLibTiffDecode(
char *mode = "r";
TIFF *tiff;
uint16 photometric = 0; // init to not PHOTOMETRIC_YCBCR
uint16 compression;
int isYCbCr = 0;
uint16 planarconfig = 0;
int planes = 1;
@ -509,9 +510,17 @@ ImagingLibTiffDecode(
TIFFGetField(tiff, TIFFTAG_PHOTOMETRIC, &photometric);
isYCbCr = photometric == PHOTOMETRIC_YCBCR;
TIFFGetField(tiff, TIFFTAG_COMPRESSION, &compression);
TIFFGetFieldDefaulted(tiff, TIFFTAG_PLANARCONFIG, &planarconfig);
isYCbCr = photometric == PHOTOMETRIC_YCBCR;
if (isYCbCr && compression == COMPRESSION_JPEG && planarconfig == PLANARCONFIG_CONTIG) {
// If using new JPEG compression, let libjpeg do RGB convertion
TIFFSetField(tiff, TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RGB);
isYCbCr = 0;
}
// YCbCr data is read as RGB by libtiff and we don't need to worry about planar storage in that case
// if number of bands is 1, there is no difference with contig case
if (planarconfig == PLANARCONFIG_SEPARATE &&