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Update documentation: img2pdf now supports alpha channels

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mara0004 2021-09-19 08:50:50 +00:00 committed by Gogs
parent 6eec05c11c
commit cde7472d15
1 changed files with 3 additions and 3 deletions
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src/img2pdf.py
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@ -3355,9 +3355,9 @@ 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.
that PNG uses.
For images with transparency, the alpha channel will be stored as a separate
soft mask. This is lossless, too.
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