Datacolor User to User Support Group.

Hi David,

Thank you for the quick response. 
Yes, it's Windows and Spyder2 Pro.

The reason I asked is not really performance. Visually, images "looked
the best" or "how they were meant to be" in PS with #2 setup. It's
really subjective, but it made me unsure.

Thanks for the clarification!

Sandor

--- In colorvision_group@yahoogroups.com, CDTobie@... wrote:
>
> 
> 
> 
> >Colorvisionstartup.exe is ColorVision's application which loads the
> calibration profile into the video card. What I am unsure is if I
> really need it.
> 
> 
> 
> 
> You say .exe, so I will have to assume Windows. And you say
ColorVisionStartup, 
> 
> so I will have to assume Spyder2. If you do not have the Startup
active under
> 
> Windows, then the profile VLUT data will not get loaded, and your
calibration
> 
> will not be correct. On the Mac this is less critical, as the OS
loads the VLUTs.
> 
> 
> >If I use Photoshop, there are 3 states:
> 
> >1. No ICC profile assigned to the display: this is clear, I'm working
> on an uncalibrated monitor.
> 
> Photoshop will utilize an ICC profile for your display, even if it
has to assume sRGB.
> 
> There is no way to really turn this off; only to bust it, by having
no profiles, not even sRGB. 
> 
> You need a custom profile and its LUTs for best results.
> 
> 
> 
> 
> >Photoshop and Windows built in image
> viewer (which does not understand profiles) displays a given image the
> same way.
> 
> Thats because they are both assuming sRGB at that point... but you
are not considering
> 
> the LUTs, which get used for both color managed apps like Photoshop,
and noncolor managed
> 
> ones like the Windows Image Viewer.
> 
> 
> 
> >2. ICC profile is assigned to the display, but colorvisionstartup.exe
> is not started: Photoshop interprets the assigned profile, and
> displays the images according to it.
> 
> And shows the wrong results because the video corrections have not
been loaded
> 
> at startup. Wrong 
> result, even with the right profile...
> 
> 
> >Photoshop and Windows built in image viewer displays a given image
> differently.
> 
> But both incorrect...
> 
> >3. ICC profile is assigned to the display, and colorvisionstartup.exe
> is started: There is a visible difference on the whole screen when
> this app starts.
> 
> 
> 
> 
> Because the VLUTs have been loaded. So now Photoshop, or any CM app,
will
> 
> show correct color, which they would not, in "2" above...
> 
> 
> 
> 
> >PS and Windows built in image viewer are still
> 
> different to each other, but they also display images differently than
> in case #2. It's like in this case, the profile is applied "two times".
> 
> 
> 
> 
> See explanation above... you are only considering the profile, not
the video
> 
> corrections...
> 
> >>So my question is: do I need this program at all or PS can manage the
> assigned profiles alone. In the latter case: what is this application
> is for?
> 
> 
> 
> 
> To do a number of things, like warn when your display calibration is
outdated,
> 
> but most critically to load the VLUTs on startup, which is central
to color management.
> 
> 
> 
> 
> I feel its necessary to comment here on the "under the hood"
mentality, more common on Windows,
> 
> where users want to pull shiny parts out from under the hood and
throw them away, to make 
> 
> the car lighter, so it
> 
> will go zero to sixty a fraction faster. Newer cars, and newer
software, is more complex, and
> 
> do not do well with such tinkering. For instance, our Spyder2
Startup item has been replaced
> 
> with a full 
> time utility with Spyder3, that has a long list of important tasks.
But as soon as
> 
> Spyder3 was released, the tinkerers immediately began emailing me
and asking if they could 
> 
> just throw it away. The answer, in a word, is NO... <G>
> 
> 
> 
> 
> C. David Tobie
> Product Technology Manager
> ColorVision, Inc.
> CDTobie@...
> www.colorvision.com
> 
> 
> -----Original Message-----
> From: sandor_px <ppsandor@...>
> To: colorvision_group@yahoogroups.com
> Sent: Thu, 18 Sep 2008 3:10 am
> Subject: [colorvision_group] Exact behavior of Colorvisionstartup
(Spyder2 Pro)
> 
> 
> 
> 
> 
> 
> 
> 
> Hi,
> 
> Colorvisionstartup.exe is ColorVision's application which loads the
> calibration profile into the video card. What I am unsure is if I
> really need it.
> 
> If I use Photoshop, there are 3 states:
> 
> 1. No ICC profile assigned to the display: this is clear, I'm working
> on an uncalibrated monitor. Photoshop and Windows built in image
> viewer (which does not understand profiles) displays a given image the
> same way.
> 
> 2. ICC profile is assigned to the display, but colorvisionstartup.exe
> is not started: Photoshop interprets the assigned profile, and
> displays the images according to it.
> Photoshop and Windows built in image viewer displays a given image
> differently.
> 
> 3. ICC profile is assigned to the display, and colorvisionstartup.exe
> is started: There is a visible difference on the whole screen when
> this app starts. PS and Windows built in image viewer are still
> different to each other, but they also display images differently than
> in case #2. It's like in this case, th
> e profile is applied "two times".
> 
> So my question is: do I need this program at all or PS can manage the
> assigned profiles alone. In the latter case: what is this application
> is for?
> 
> Sandor
> 
> 
> ------------------------------------
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