Re: ColorSync and OS X inkjets
Re: ColorSync and OS X inkjets
- Subject: Re: ColorSync and OS X inkjets
- From: Dave Camp <email@hidden>
- Date: Tue, 19 Mar 2002 20:28:41 -0800
Here are some questions I asked today of Paul Danbold, Engineering Manager
for the Graphics and Imaging group at Apple, and the responses I received.
As I was explaining (and possibly not doing a good job of it), the
application has no say in what happens to the job once it's spooled. It
hands it's data tagged with source profiles to the printing subsystem
(Tioga) and it's done. Tioga then transforms the job from the source
space(s) to the output space for the printer and rips the page.
By the time the printer module gets the ripped page, it's already be
converted to the factory or user selected output space. The printer module
cannot prevent this, although it could perform additional transformations if
it wanted to.
I hope the clears up some of the confusion.
As for Bruce's observations, I have no reason to doubt that he is getting
the output he is describing (engineering rule #5, never tell a user what
they are experiencing is not possible). However, I don't think it's for the
reasons described, as Apple says it does not work that way and my own
experience writing Printer Modules confirms this. There must be some other
factor at work here.
Dave
------ Forwarded Message
From: Paul Danbold
Date: Tue, 19 Mar 2002 20:07:02 -0800
Subject: Re: Printer Modules and ColorSync
On 3/19/02 9:42 AM, "dave camp" <email@hidden> wrote:
>
Is it correct that when an application prints a job (QuickDraw/Quartz or
>
Carbon/Cocoa) that a ColorSync transformation is _always_ applied by Tioga
>
from the source color space to an output space (either a factory profile or
>
a profile selected in the ColorSync panel Output menu?
Yes with the one exception, noted below.
>
If the answer to that is yes, is there any way for an application to request
>
that no transformation should occur, like if the user was printing a target
>
to be measured?
Not in the current OS.
>
If the source image and the output profile are the same, is the conversion
>
skipped? In other words, if I had an RGB image in Preview tagged with sRGB
>
and my Output profile in the ColorSync panel was set to sRGB, would the
>
image data effectively pass through to the Printer Module unchanged?
Yes.
>
Thanks,
>
Dave
Short answers but I hope they help.
-Paul
------ End of Forwarded Message
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