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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 Functionality
------------- -------------
This program will take a list of images and produce a PDF file with the This program will take a list of images and produce a PDF file with the images
images embedded in it. JPEG and JPEG2000 images will be included without embedded in it. JPEG and JPEG2000 images will be included without
recompression. Images in other formats will be included with zip/flate recompression. Images in other formats will be included with zip/flate
encoding. As a result, this tool is able to losslessly wrap any image encoding which usually leads to an increase in the resulting size because
into a PDF container with a quality-filesize ratio that is typically better formats like png compress better than PDF which just zip/flate compresses the
than that of existing tools. 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 For example, imagemagick will re-encode the input JPEG image (thus changing
its content): 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. 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 Also, since JPEG and JPEG2000 images are not reencoded, conversion with
img2pdf is several (ten to hundred) times faster than with imagemagick. img2pdf is several times faster than with other tools.
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.
Usage Usage