Display colorsync profile remains unapplied?

[Christopher Hunt]

Thanks Roland - good to know that others can see this too. I actually  
think this bug may have been around for a while as we're running  
10.4.8 on our remote machine. I have also witnessed this on 10.4.9.

Do you know of a method to confirm what profile is being used on the  
secondary display when mirrored? It'd be good to have this  
information for when I report the bug to Apple.

Meanwhile I think I'll select the Sanyo XP50/55 profile for both  
displays so at least they look similar.

Thanks for helping me get to the bottom of this.

Kind regards,
Christopher

On 28/03/2007, at 12:42 PM, Roland Torres wrote:

> Hi Christopher,
>
> I just went over and ran a test. We are driving 2 screens from a  
> single video card, not mirroring them, so we see individual color  
> profile panels on each display. When I switched the setup to have  
> mirrored displays, I see exactly what you are seeing: the color  
> profile changes only the first display in the arrangement. The  
> other display remains unchanged. So I think the primary issue here  
> isn't your projectors, but this bug in 10.4.9.
>
> Roland
>
> On Mar 27, 2007, at 7:19 PM, Christopher Hunt wrote:
>
>> Hi Roland,
>>
>> Thanks for your reply. I am using the one card with two DVI ports  
>> on the same card. When I mirror the display I only get one panel.  
>> When I un-mirror I get two panels - one for each display. The  
>> settings of this panel I get when mirroring generally apply to  
>> both displays e.g. if I change the resolution then the setting  
>> will be effected on both (as you'd expect). However if I change  
>> the color sync selection to Generic RGB then only the main display  
>> shows a change in colour.
>>
>> Are you mirroring the displays or are you using two cards and one  
>> DVI port from each or one card and both DVI ports (like me)?
>>
>> Kind regards,
>> Christopher
>>
>> On 28/03/2007, at 10:40 AM, Roland Torres wrote:
>>
>>>
>>> On Mar 27, 2007, at 5:14 PM, Christopher Hunt wrote:
>>>
>>>> OK, I've rebooted the machine and have now seen the display  
>>>> myself. To me it looks as though display 2 is using the settings  
>>>> of the Generic RGB profile where display 1 is using the Sanyo  
>>>> XP50/55 profile (which is dimmer). Now it could still be to do  
>>>> with the differences discussed between the projectors etc., but  
>>>> I just don't "feel" that it is having looked at the screens  
>>>> physically - the blue just looks too different - richer on  
>>>> display 2 (the brighter one).
>>>>
>>>> I performed a little experiment here and note that if I mirror  
>>>> two displays (doesn't matter what type of displays these are)  
>>>> and select Generic RGB, the secondary display does not effect  
>>>> the setting. I suspect that the secondary display uses the  
>>>> default setting for the monitor based on what it looks like to me.
>>>>
>>>> Does this concur with anyone else's observations? Should you not  
>>>> expect that the colour profile setting is effected to both  
>>>> displays?
>>>>
>>> Hi Christopher, if you're using the same video card, and a  
>>> separate DVI port for each projector, then I would expect each  
>>> display to get its own Prefs panel pop up on it, where you can  
>>> choose the profile for each independently. Isn't this what you're  
>>> seeing? We have a 2-headed setup here, and that's how it's  
>>> working for us.
>>