I see that you're loading and saving the original image, that explains
it. Likely the default compression level of java achieves a higher jpeg
compression than in the original image.
This can be seen at a higher resolution, the embedded jpeg file has more
artefacts ("shadows") than the original one.
The real question is, where do the original images come from. If it is a
photograph, then keep the jpeg format. If it is something with sharp
edges, e.g. a powerpoint image, don't compress with jpeg at all, use
png. If it is a b/w scan that is really b/w, compress into TIFF with
CCITT G4 compression.
Tilman
Am 02.06.2020 um 07:36 schrieb andreas.sta...@dachser.com:
Hello,
here is the shared source:
https://1drv.ms/u/s!AiMGZ3ozCiq9gdxAJXdBtfte8iD70A?e=P5AOV5
Freundliche Grüße / Best Regards
Andreas Staiti
Von: Tilman Hausherr<thaush...@t-online.de>
An:users@pdfbox.apache.org
Datum: 29.05.2020 19:44
Betreff: Re: Antwort: Re: Create pdf files with LosslessFactory
Am 29.05.2020 um 10:10 schriebandreas.sta...@dachser.com:
Hello,
here is a sample include the source. The pdf file is really smaller
the the jpeg file. Why?
Please upload both files on a sharehoster for analysis. Binary
attachments are usually blocked.
Tilman
Freundliche Grüße / Best Regards
Andreas Staiti
Shared Software Services
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Von: Tilman Hausherr<thaush...@t-online.de>
An:users@pdfbox.apache.org
Datum: 27.05.2020 19:52
Betreff: Re: Create pdf files with LosslessFactory
------------------------------------------------------------------------
Hi,
createFromFile is best for JPEG files. Because there the files are used
unchanged. With createFromImage they are decompressed and recompressed
with the Flate filter, this is a lossless compression.
I am surprised that the original JPEG would be 794 kb and the PDF 766
kb. The PDF shouldn't be smaller than the image. Please upload both
files on a sharehoster for analysis.
Tilman
Am 27.05.2020 um 15:32 schriebandreas.sta...@dachser.com:
Hello togehter,
if i create a inline jpeg inside a pdf file, with
LosslessFactory.createFromImage(..) the created pdf file have a size
of
3293 kb. The same file created with PDImageObject.createFromFile(..)
have
a size of
766 kb. The resolution of the jpeg image is 2480 x 3488 pixels. The
size
of the image is 794 kb. The image should be inserted unchanged in
the pdf
file.
What is the main difference between creating images with
LosslessFactory
and PDImageObject.createFromFile ? What is in my case the best method?
Freundliche Grüße / Best Regards
Andreas Staiti
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