Am 24.08.2017 um 10:23 schrieb Andreas Lehmkühler:
there any jbig2-viewer available?
In theory, yes, for example XnView supports JBIG2 via jbig2dec.exe. In
reality, support for the various cases covered in the test suite is
rather spotty: many of the images cannot be decoded with XnView. So,
strange as it might seem, I don't know of any reliable stand-alone JBIG2
viewer.
However, obviously those images can be decoded using the plugin. I've
attached PNG versions of them to a comment on the above issue:
https://github.com/levigo/jbig2-imageio/issues/48#issuecomment-324556311
Cool, I've already thought about converting them myself, but you were faster.
Thanks. I'll have a look after the weekend as my time will be limited the next
few days.
Thanks!
Losing this image would be bad, though, since it is the only halftone
region sample bitstream in there.
Maybe, we should think about a README which expains the origin of some/all of
the test files
Yes, good idea. I already started documenting that in
https://github.com/levigo/jbig2-imageio/issues/48. I'll throw that into
a README once I'm done.
2. Files provided to us with the permission to use them for testing
purposes
201231100*.jb2 is the only case, seems to be a public U.S.
document anyway and therefore in the public domain. I have not
contacted the original provider of the files for the simple reason
that his or her e-mail address has been lost when the Googlecode site
went into archived state. >
3. Files with content so trivial that copyright should not be an
issue, i.e. fragments of bitstreams, isolated segments, trivial test
images
This isn't a question of copyright but of license and/or privacy.
The files in this category are sampledata_page(1,2,3).jb2. The content
is obviously not a matter of privacy. Regarding the license I am
currently asking around whether anyone still knows where this came from
(unfortunately we lost some very early RCS history from before we
open-sourced the component).
I just learned that those files contain sample bitstreams contained as
hex-dumps within the standard. The standards are copyrighted by ITU/ISO
and contain the following notice:
All rights reserved. No part of this publication may be reproduced
or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without
permission in writing from the ITU.
Although I don't think that the authors and publishers intention was to
prevent use of the sample bitstreams for testing purposes, the statement
clearly covers them. WDYT?
I'm going to e-mail ITU wuth this question although I am not too
optimistic about getting an answer some within this decade :-)
Jörg
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