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Remove alpha layer from PNG files for img2pdf

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Fixes issue #1254
This commit is contained in:
Martin Müller 2022-02-21 22:06:43 +01:00
parent 7bc8325df9
commit 41494ee689
1 changed files with 22 additions and 0 deletions
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22
src/paperless_tesseract/parsers.py
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@ -66,6 +66,16 @@ class RasterisedDocumentParser(DocumentParser):
"image/gif",
]
def has_alpha(self, image):
try:
with Image.open(image) as im:
return im.mode in ('RGBA', 'LA')
except Exception as e:
self.log(
'warning',
f"Error while check for alpha channel in image {image}: {e}")
return None
def get_dpi(self, image):
try:
with Image.open(image) as im:
@ -182,6 +192,18 @@ class RasterisedDocumentParser(DocumentParser):
if self.is_image(mime_type):
dpi = self.get_dpi(input_file)
a4_dpi = self.calculate_a4_dpi(input_file)
if self.has_alpha(input_file):
self.log(
"info",
f"Removing alpha layer from {input_file} for compatibility with img2pdf"
)
with Image.open(input_file) as im:
background = Image.new('RGBA', im.size, (255, 255, 255))
background.alpha_composite(im)
background = background.convert('RGB')
background.save(input_file, format=im.format)
if dpi:
self.log(
"debug",