From: "Hartmut Henkel" <hartmut_henkel@gmx.de>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>, ntg-context@ntg.nl
Subject: Re: compresslevel and png graphics (mkiv)
Date: Fri, 27 May 2011 15:09:14 +0200 [thread overview]
Message-ID: <20110527130914.171040@gmx.net> (raw)
In-Reply-To: <4DDF91BF.8030806@gmx.net>
> > @luigi: an ICC profile definitely breaks the <png copy> rules
> >
> > The only chunks left are
> >
> > IHDR PNG image header: 5900x4094, 8bits/sample, truecolor,
> noninterlaced
> > IDAT PNG image data
> > ..
> > IDAT PNG image data
> > IEND end-of-image marker
> >
> > Mh, where is the show stopper? The compression method?
> >
> Looks like some of ConTeXt PDF/X-related settings is causing this. If I
> reduce the code to the pure picture, the '(PNG copy)' is triggered.
> Probably the active color management (default color space) is breaking
> the copy process here.
must be some \pdfimageapplygamma > 0, only this and the \pdfimagehicolor
primitive can influence this low level stuff.
Btw, just \pdfimageapplygamma > 0 (without setting \pdfgamma and \pdfimagegamma) already changes the PNG image, since the luatex (and pdftex) internal defaults are not gamma-neutral. No idea if (and then
to which value) this should be fixed.
Regards, Hartmut
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
next prev parent reply other threads:[~2011-05-27 13:09 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-25 12:43 Peter Rolf
2011-05-25 14:39 ` Hans Hagen
2011-05-25 14:48 ` Taco Hoekwater
2011-05-25 16:05 ` Peter Rolf
2011-05-25 19:54 ` Hartmut Henkel
2011-05-26 10:52 ` Peter Rolf
2011-05-26 11:22 ` luigi scarso
2011-05-26 16:17 ` Peter Rolf
2011-05-27 11:57 ` Peter Rolf
2011-05-27 13:09 ` Hartmut Henkel [this message]
2011-05-27 15:11 ` Peter Rolf
2011-05-27 15:19 ` luigi scarso
2011-05-27 15:34 ` Peter Rolf
2011-05-25 14:40 ` Hans Hagen
2011-05-26 17:32 ` mathew
2011-05-26 17:43 ` mathew
2011-05-27 6:17 ` Henning Hraban Ramm
2011-05-27 7:43 ` Hans Hagen
2011-05-26 17:55 ` mathew
2011-05-26 17:58 ` Martin Schröder
2011-05-26 22:52 ` George N. White III
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110527130914.171040@gmx.net \
--to=hartmut_henkel@gmx.de \
--cc=ntg-context@ntg.nl \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).