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Added saving LA images as PDFs

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This commit is contained in:
Andrew Murray 2023-07-22 20:13:55 +10:00
parent c108d9ddb0
commit 0a0a3fc51f
3 changed files with 11 additions and 5 deletions
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9
Tests/test_file_pdf.py
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@ -43,8 +43,9 @@ def test_save(tmp_path, mode):
@skip_unless_feature("jpg_2000") @skip_unless_feature("jpg_2000")
def test_save_rgba(tmp_path): @pytest.mark.parametrize("mode", ("LA", "RGBA"))
helper_save_as_pdf(tmp_path, "RGBA") def test_save_alpha(tmp_path, mode):
helper_save_as_pdf(tmp_path, mode)
def test_monochrome(tmp_path): def test_monochrome(tmp_path):
@ -57,8 +58,8 @@ def test_monochrome(tmp_path):
def test_unsupported_mode(tmp_path): def test_unsupported_mode(tmp_path):
im = hopper("LA") im = hopper("PA")
outfile = str(tmp_path / "temp_LA.pdf") outfile = str(tmp_path / "temp_PA.pdf")
with pytest.raises(ValueError): with pytest.raises(ValueError):
im.save(outfile) im.save(outfile)

2
docs/handbook/image-file-formats.rst
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@ -1486,7 +1486,7 @@ files. Different encoding methods are used, depending on the image mode.
unavailable unavailable
* L, RGB and CMYK mode images use JPEG encoding * L, RGB and CMYK mode images use JPEG encoding
* P mode images use HEX encoding * P mode images use HEX encoding
* RGBA mode images use JPEG2000 encoding * LA and RGBA mode images use JPEG2000 encoding
.. _pdf-saving: .. _pdf-saving:

5
src/PIL/PdfImagePlugin.py
View File

@ -159,6 +159,11 @@ def _save(im, fp, filename, save_all=False):
# params = f"<< /Predictor 15 /Columns {width-2} >>" # params = f"<< /Predictor 15 /Columns {width-2} >>"
colorspace = PdfParser.PdfName("DeviceGray") colorspace = PdfParser.PdfName("DeviceGray")
procset = "ImageB" # grayscale procset = "ImageB" # grayscale
elif im.mode == "LA":
filter = "JPXDecode"
# params = f"<< /Predictor 15 /Columns {width-2} >>"
colorspace = PdfParser.PdfName("DeviceGray")
procset = "ImageB" # grayscale
elif im.mode == "P": elif im.mode == "P":
filter = "ASCIIHexDecode" filter = "ASCIIHexDecode"
palette = im.getpalette() palette = im.getpalette()