Re: ColorSync and printing -- Panther (2 of 2)
Re: ColorSync and printing -- Panther (2 of 2)
- Subject: Re: ColorSync and printing -- Panther (2 of 2)
- From: John Fieber <email@hidden>
- Date: Fri, 19 Dec 2003 11:11:05 -0500
On Dec 19, 2003, at 6:07 AM, Rolf Gierling wrote:
Chris Murphy wrote:
I want the application
to be able to say "hello, I'm doing the color management ColorSync,
don't do anything else!!" and from there ensures double color
management does not occur.
As John wrote, if your output is properly tagged with profiles
(you did match to your output device), ColorSync does see that
there is nothing to match. This null-transform does not hurt
anybody.
An important detail is missing here: for the null-transform to happen,
the application has to know for SURE what the output profile the driver
is going to use. As it stands with Tioga drivers, there doesn't appear
to be any reliable way for the application to figure that out. The
driver may (and usually does) register a profile with colorsync, but
once the driver has the job in hand and is setting up the pdf to raster
conversion, it is free to substitute any profile it desires and the
application (or the user for that matter) has no way of knowing what
profile is actually being used. When printing to my Canon i960 the
Summary pane of the print panel says that the BJ Color Printer Profile
2000 will be used. From the output it is clear as day that one of the
other four profiles that the driver comes with is being used, but which
one? Only the driver knows.
Now, there is a "no color adjustment" option in the driver which sets
the profile to "System Default" (Generic RGB I presume?) which, as
near as I can tell, actually gets used. (Otherwise Photoshop 7, which
seems to deposit EVERYTHING into the print system tagged as Generic RGB
regardless of driver settings, would be utterly incapable of printing
accurate color!) But correct printing via a null-transform depends on
the USER knowing/remembering to select driver options that don't lie
about the profile being use. And how is the user supposed to know
which driver options meet that criteria? I sure don't know. The
bottom line is that for a Positive User Experience, the APPLICATION
needs unambiguous control over whether color management happens
downstream. As it stands, that doesn't seem possible.
The situation may be better for CUPS drivers, but printer vendors are
not exactly falling all over themselves to provide us with CUPS drivers
for commodity inkjet printers.
-john
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