RE: Mission impossible
RE: Mission impossible
- Subject: RE: Mission impossible
- From: Roger Breton <email@hidden>
- Date: Sun, 30 Jan 2011 17:31:30 -0500
Marc,
Please correct me if I am wrong but I've always been under the (wrong?)
impression that Photoshop wrote to the video card directly? On Windows or
MacOSX. To me, the relation between Photoshop and the host OS was as follows
:
a) Load some RGB image from disk;
b) Assign or read its embedded RGB ICC profile;
You're saying that, from this point on, because of the implementation of
color management at the OS level, providing that there exists some ICC
profile at the system level describing the monitor's characterization, all
Photoshop does is write the device values into the video RAM? And it's up to
the host CMM to pick up the tab at that point to :
c) Convert from the device RGB value to the actual monitor profile using the
CMM?
I must not be getting this chain of conversion right, somehow.
I realize this is about separation of duty. That much I know we'll agree on.
I figure, since Photoshop *knows* about the active monitor profile, I always
thought, naively perhaps, that Photoshop always matched (converted) from the
Document profile to the Monitor profile, and wrote the converted values in
the video RAM for display.
I can see Photoshop making a system call to carry this conversion but I fail
to see how Photoshop could this differently.
Kindest regards / Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden
[mailto:colorsync-users-bounces+graxx=email@hidden] On
Behalf Of Marc Levine
Sent: January-29-11 3:29 PM
To: email@hidden
Cc: Breton Roger
Subject: Re: Mission impossible
On Jan 29, 2011, at 3:02 PM, email@hidden wrote:
> there is no way to be able to coerce Photoshop into choosing a monitor
> profile of our choosing, in lieu of whatever can be found in either
> the Registry, on Windows, I believe, or the System Profile, on Mac OSX.
Hi Roger,
I believe the problem is that it's not Photoshop's duty to send color from
the PCS to the display. It's the OS that does that. You can dictate which
colors Photoshop sends to the PCS by switching either the workspace or the
assigned profile. You can even ask Photoshop to "dial back" the colors by
reducing the "monitor saturation". However, once those color values get to
the PCS, Photoshop says good-bye.
The only workaround I could see if setting up some time in the lab where you
could calibrate in admin mode and save the profiles. You could then toggle
them around in class. If you like, so could still walk the students through
the steps (like you do today). In general, I would recommend keeping the
concept of monitor calibration/profiling and photoshop color management
distinctly separate. The last thing you would want is for students to get
the impression that they should assign their monitor profile to an image.
Photoshop is smarter than the a-ver-age bear (sometimes, too smart), but I
don't believe it can get around that basic color linkage between the display
and the OS.
Marc _______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden