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Write JFIF header when saving JPEG

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This commit is contained in:
Andrew Murray 2020-05-24 23:58:30 +10:00
parent 7fb21bcb62
commit 660894cd36
2 changed files with 11 additions and 8 deletions
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18
Tests/test_file_jpeg.py
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@ -91,15 +91,17 @@ class TestFileJpeg:
assert k > 0.9
def test_dpi(self):
def test(xdpi, ydpi=None):
with Image.open(TEST_FILE) as im:
im = self.roundtrip(im, dpi=(xdpi, ydpi or xdpi))
return im.info.get("dpi")
for test_image_path in [TEST_FILE, "Tests/images/pil_sample_cmyk.jpg"]:
assert test(72) == (72, 72)
assert test(300) == (300, 300)
assert test(100, 200) == (100, 200)
assert test(0) is None # square pixels
def test(xdpi, ydpi=None):
with Image.open(test_image_path) as im:
im = self.roundtrip(im, dpi=(xdpi, ydpi or xdpi))
return im.info.get("dpi")
assert test(72) == (72, 72)
assert test(300) == (300, 300)
assert test(100, 200) == (100, 200)
assert test(0) is None # square pixels
def test_icc(self, tmp_path):
# Test ICC support

1
src/libImaging/JpegEncode.c
View File

@ -222,6 +222,7 @@ ImagingJpegEncode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
context->cinfo.smoothing_factor = context->smooth;
context->cinfo.optimize_coding = (boolean) context->optimize;
if (context->xdpi > 0 && context->ydpi > 0) {
context->cinfo.write_JFIF_header = TRUE;
context->cinfo.density_unit = 1; /* dots per inch */
context->cinfo.X_density = context->xdpi;
context->cinfo.Y_density = context->ydpi;