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README.md: add comparison to podofoimg2pdf

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Johannes 'josch' Schauer 2020-04-05 12:15:53 +02:00
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@ -257,6 +257,24 @@ of the plain pixel data and thus needlessly increases the output file size:
4500182 original.png
9318120 pdflatex.pdf
Comparison to podofoimg2pdf
---------------------------
Like pdfLaTeX, podofoimg2pdf is able to perform a lossless conversion from JPEG
to PDF by plainly embedding the JPEG data into the pdf container. But just like
pdfLaTeX it uses flate compression for all other file formats, thus sometimes
resulting in larger files than necessary.
$ convert logo: -resize 8000x original.png
$ podofoimg2pdf out.pdf original.png
stat --format="%s %n" original.png out.pdf
4500181 original.png
9335629 out.pdf
It also only supports JPEG, PNG and TIF as input and lacks many of the
convenience features of img2pdf like page sizes, borders, rotation and
metadata.
Comparison to Tesseract OCR
---------------------------
@ -267,3 +285,4 @@ you should safely be able to use Tesseract instead of img2pdf. For other input,
Tesseract might not do a lossless conversion. For example it converts CMYK
input to RGB and removes the alpha channel from images with transparency. For
multipage TIFF or animated GIF, it will only convert the first frame.