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Added PDF 2d-resolution export

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This commit is contained in:
Zheng Jie Tan 2019-04-03 01:11:42 -04:00
parent 5a2ecd13dd
commit eacdb3d843
3 changed files with 18 additions and 7 deletions
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4
Tests/test_file_pdf.py
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@ -64,6 +64,10 @@ class TestFilePdf(PillowTestCase):
# Act / Assert # Act / Assert
self.helper_save_as_pdf(mode) self.helper_save_as_pdf(mode)
def test_resolution(self):
self.helper_save_as_pdf("RGB", resolution=300.5)
self.helper_save_as_pdf("RGB", resolution=(300, 150))
def test_unsupported_mode(self): def test_unsupported_mode(self):
im = hopper("LA") im = hopper("LA")
outfile = self.tempfile("temp_LA.pdf") outfile = self.tempfile("temp_LA.pdf")

6
docs/handbook/image-file-formats.rst
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@ -1054,9 +1054,9 @@ The :py:meth:`~PIL.Image.Image.save` method can take the following keyword argum
.. versionadded:: 5.1.0 .. versionadded:: 5.1.0
**resolution** **resolution**
Image resolution in DPI. This, together with the number of pixels in the Image resolution in DPI either as a numeric value or ``(xdpi, ydpi)`` tuple.
image, will determine the physical dimensions of the page that will be This, together with the number of pixels in the image, will determine the
saved in the PDF. physical dimensions of the page that will be saved in the PDF.
**title** **title**
The document’s title. If not appending to an existing PDF file, this will The document’s title. If not appending to an existing PDF file, this will

15
src/PIL/PdfImagePlugin.py
View File

@ -56,6 +56,13 @@ def _save(im, fp, filename, save_all=False):
existing_pdf = PdfParser.PdfParser(f=fp, filename=filename, mode="w+b") existing_pdf = PdfParser.PdfParser(f=fp, filename=filename, mode="w+b")
resolution = im.encoderinfo.get("resolution", 72.0) resolution = im.encoderinfo.get("resolution", 72.0)
# Allows the user to specify either a 1D resolution or 2D resolution.
if not isinstance(resolution, (list, tuple)):
pdf_width_res = resolution
pdf_height_res = resolution
else:
pdf_width_res = resolution[0]
pdf_height_res = resolution[1]
info = { info = {
"title": None if is_appending else os.path.splitext( "title": None if is_appending else os.path.splitext(
@ -211,8 +218,8 @@ def _save(im, fp, filename, save_all=False):
MediaBox=[ MediaBox=[
0, 0,
0, 0,
int(width * 72.0 / resolution), int(width * 72.0 / pdf_width_res),
int(height * 72.0 / resolution) int(height * 72.0 / pdf_height_res)
], ],
Contents=contents_refs[pageNumber]) Contents=contents_refs[pageNumber])
@ -221,8 +228,8 @@ def _save(im, fp, filename, save_all=False):
page_contents = PdfParser.make_bytes( page_contents = PdfParser.make_bytes(
"q %d 0 0 %d 0 0 cm /image Do Q\n" % ( "q %d 0 0 %d 0 0 cm /image Do Q\n" % (
int(width * 72.0 / resolution), int(width * 72.0 / pdf_width_res),
int(height * 72.0 / resolution))) int(height * 72.0 / pdf_height_res)))
existing_pdf.write_obj(contents_refs[pageNumber], existing_pdf.write_obj(contents_refs[pageNumber],
stream=page_contents) stream=page_contents)