Re: Epson Printers/Colorsync/OSX
Re: Epson Printers/Colorsync/OSX
- Subject: Re: Epson Printers/Colorsync/OSX
- From: Dave Camp <email@hidden>
- Date: Sat, 12 Oct 2002 09:33:43 -0700
At this point, the only place the real answer can from from is Apple.
Maybe John Z will poke his head in and clear up the confusion.
On one hand, we have advanced users such as yourself who are observing
what appears to be printed output that is not automatically color
managed, and are able to verify your observations with hardware
measurements. This apparently can be done from multiple applications
and matches results from OS 9 which is not automatically color managed.
On the other hand, application and printer developers (at least me, I'm
not aware of any other printer developers posting on the list) say they
are not aware of a "bypass ColorSync" API. The printing group at Apple
tells me no such API exists for printer modules. And TN2035 indicates
that OS X raster print jobs are color managed and always have been
(although exactly how that works has changed over time).
I definitely agree that this does not add up. The technical information
available does not match the observable results. That's not good.
I hope my postings have not put anyone off. That has never been my
intent. It's just that the engineer-geek part of my brain tries to set
technical issues straight when they don't look right. :-) That and I
try to contribute technical info when it looks like it might be
helpful, as there don't seem to be many other people from the developer
side of the fence on the list.
Have a nice weekend.
Dave
On Friday, October 11, 2002, at 10:31 PM, Chris Murphy wrote:
>
>
> There are APIs in ColorSync that allow smart apps to deliberately
>
> bypass OS color management.
>
>
I've asked a couple of major app developers about this and it was news
>
to them and they weren't aware of it being used. Now the following is
>
pure speculation on my part, but I think the only applications that
>
need to be explicitly non-color managed are the display
>
calibration/profiling applications. Whereas it's the printer drivers
>
that need to make use of the API to turn color management off for
>
output, and it makes sense they'd use this API always unless the
>
ColorSync option were selected in the printer driver.
>
>
Perhaps early drivers weren't doing this, and perhaps there are some
>
remaining obscured drivers that still don't do it, but the ones I've
>
used and tested (1280 and 2200), aren't a problem.
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