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