Re: Printing profile test targets WITHOUT photoshop
Re: Printing profile test targets WITHOUT photoshop
- Subject: Re: Printing profile test targets WITHOUT photoshop
- From: Roy Harrington <email@hidden>
- Date: Tue, 18 Aug 2009 14:31:37 -0700
I've actually spent quite a bit of time on this from the programming
point of view. There's a mostly undocumented flag that is supposed to
disable color management inside the OS. You'll find references to it
AP_ColorMatchingMode=AP_ApplicationColorMatching in PMTicket.h
Even so it appears to work with an RGB driver but not a grayscale one.
The other approach at the programming level that seems to work is
to strip the profile from the data before sending to the OS. The system
appears to assume the "default" and then convert to the "default".
Roy
On Tue, Aug 18, 2009 at 7:26 AM, Graeme Gill<email@hidden> wrote:
> Eric Chan wrote:
>>
>> Moving forward, OS X is taking steps to prevent accidental printing
>> without color management. This makes it unlikely that you can use the
>> standard OS X apps like Preview to print profile targets reliably. Tagging
>> it with Generic RGB will work today, but not tomorrow when Snow Leopard
>> launches (and switches to a default profile of sRGB, not Generic RGB). And
>> tagging the target with sRGB tomorrow may not work for the future (should
>> future versions of OS X switch to another default profile).
>
> I always thought that this approach to "disabling" color management is a bad
> idea because it's overly fragile, yet in the past this has been what various
> people from Apple have recommended.
>
> You've indicated what doesn't work, but haven't said what does work.
>
> What is the new, official way to disable color management during
> printing, so as to be able to print test charts ?
>
> [Feel free to point towards programming information, although
> I'm sure other on this list will more be interested in application
> information.]
>
> Graeme Gill.
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