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README.md: update treatment of non-jpeg files

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josch 2015-05-09 07:39:50 +02:00
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README.md
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@ -19,12 +19,15 @@ code into the garbage bin :D
Functionality
-------------
This program will take a list of images and produce a PDF file with the
images embedded in it. JPEG and JPEG2000 images will be included without
This program will take a list of images and produce a PDF file with the images
embedded in it. JPEG and JPEG2000 images will be included without
recompression. Images in other formats will be included with zip/flate
encoding. As a result, this tool is able to losslessly wrap any image
into a PDF container with a quality-filesize ratio that is typically better
than that of existing tools.
encoding which usually leads to an increase in the resulting size because
formats like png compress better than PDF which just zip/flate compresses the
RGB data. As a result, this tool is able to losslessly wrap images into a PDF
container with a quality-filesize ratio that is typically better (in case of
JPEG and JPEG2000 images) or equal (in case of other formats) than that of
existing tools.
For example, imagemagick will re-encode the input JPEG image (thus changing
its content):
@ -51,10 +54,7 @@ save other graphics formats using lossless zip compression,
and produce multi-page PDF files when more than one input image is given.
Also, since JPEG and JPEG2000 images are not reencoded, conversion with
img2pdf is several (ten to hundred) times faster than with imagemagick.
While the above convert command with a 2.8MB JPEG took 27 seconds
(on average) on my machine, conversion using img2pdf took just a
fraction of a second.
img2pdf is several times faster than with other tools.
Usage