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Reflect the fact that we now use PNG compression in the --help output

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Johannes 'josch' Schauer 2018-03-24 19:53:41 +01:00
parent e78dd80451
commit 920506b867
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1 changed files with 7 additions and 9 deletions
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src/img2pdf.py
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@ -1461,15 +1461,13 @@ def main():
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description='''\
Losslessly convert raster images to PDF without re-encoding JPEG and JPEG2000
images. This leads to a lossless conversion of JPEG and JPEG2000 images with
the only added file size coming from the PDF container itself.
Other raster graphics formats are losslessly stored in a zip/flate encoding of
their RGB representation. This might increase file size and does not store
transparency. There is nothing that can be done about that until the PDF format
allows embedding other image formats like PNG. Thus, img2pdf is primarily
useful to convert JPEG and JPEG2000 images to PDF.
Losslessly convert raster images to PDF without re-encoding PNG, JPEG, and
JPEG2000 images. This leads to a lossless conversion of PNG, JPEG and JPEG2000
images with the only added file size coming from the PDF container itself.
Other raster graphics formats are losslessly stored using the same encoding
that PNG uses. Since PDF does not support images with transparency and since
img2pdf aims to never be lossy, input images with an alpha channel are not
supported.
The output is sent to standard output so that it can be redirected into a file
or to another program as part of a shell pipe. To directly write the output