From: Peter Rolf <indiego@gmx.net>
To: ntg-context@ntg.nl
Subject: Re: compresslevel and png graphics (mkiv)
Date: Fri, 27 May 2011 17:34:23 +0200 [thread overview]
Message-ID: <4DDFC47F.2070408@gmx.net> (raw)
In-Reply-To: <BANLkTintjxqWU87HniG5QugGXsh_uTEbjQ@mail.gmail.com>
Am 27.05.2011 17:19, schrieb luigi scarso:
> On Fri, May 27, 2011 at 5:11 PM, Peter Rolf <indiego@gmx.net> wrote:
>> Am 27.05.2011 15:09, schrieb Hartmut Henkel:
>>>>> @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.
>>>
>> Sorry Hartmut, my last statement is complete BS. I made a 'blind' run in
>> my lunch break, not inspecting the pdf. And sadly I had forgotten, that
>> I changed the test file yesterday to use a small png test graphic
>> instead of my big png. *brain vs. full stomach: 0:1*
>>
>> So the PDF/X settings have no influence on this. The big png is not
>> 'copied'.
>> Anyhow, this is not a serious problem and honestly I don't have that
>> much time now. When I have some more time I will use gdb to find the
>> failing condition in writepng.w. Will be interesting, the last time I
>> used gdb is more than 10 years ago.
> if you have an example with a public png I can take a look...
>
Thanks Luigi. PM is on its way.
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next prev parent reply other threads:[~2011-05-27 15:34 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
2011-05-27 15:11 ` Peter Rolf
2011-05-27 15:19 ` luigi scarso
2011-05-27 15:34 ` Peter Rolf [this message]
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
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