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Why do some users get 8-bit colour but all other users get 24-bit colour on their Citrix session ?

Posted on 2008-10-01
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Last Modified: 2013-11-21
When some of the users log onto their Citrix session their video quality is really bad and are unable to read text on documents like PDF's.  When I went in to one of the user's display settings on their Citrix session I seen that their Colour Quality is set at 8 bit and can't be increased.

On the Citrix server I went into the Appearance settings for the Server Desktop application and the Colour setting is set to True Colour (24-bit).

Can anyone advise how I can resolve this ?

Many thanks in advance.
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Question by:PurityIT
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by:matrixnz
ID: 22613178
Have you checked the client settings?
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by:PurityIT
ID: 22613262
In what respect ?
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by:matrixnz
ID: 22613408
Well I'm not sure if you're users are using a Citrix Client or RDP Client however both have options which allow different Window Colors, this is how it determines what the window will display.  If using Citrix Client, it can usually be found under the Properties of the Citrix Client under Options Tab.  In RDP it can be found under Options - Display(tab)

Hope that helps.

Cheers

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by:PurityIT
ID: 22613444
Hi and thanks for your reply.

All the users connect to the Citrx server through the ICA web client version 10.  I know where to find the setting if the users are connecting through RDP but I don't know where to find this setting within the ICA client.  Can you further advise please ?

Many thanks in advance
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by:matrixnz
ID: 22613571
Ahh I was referring to the ICA Xenapp Client, if you're using the Web Client you maybe running out of session video memory and so the client degrades.  Check an 8bit users machine while the system has a low load see if the session reads 16bit, if it is than it will be the session video memory which is degrading.  You can modify your Memory for Session Graphics - http://support.citrix.com/article/ctx114497

Cheers
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Author Comment

by:PurityIT
ID: 22613674
Where would I find these details ?  When I go into the Display properties, Settings and Colour Settings it shows as 8 bit and I think that is why the colours look bad.

Under Farm Properties, Server default, ICA, Display then "Maximum memory to use for each sessions graphics" is set at 5625 KB.  What should this be set at ?

Many thanks in advance and I have incresed this to 500 points as it is more difficult than I had thought
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matrixnz earned 500 total points
ID: 22613934
Hi PurityIT

Did you have a look at the link I provided, this refers to the Citrix Server System, I believe what happens is:
User1, User2 etc.. logon and connect with 16bit Session using the Session Graphics Memory, when User3 logs on since there isn't enough memory to allocate to User3 it drops colors which allows the user to logon, but of course when they look it's set to 8bit.  The link above describes how to up the limit on the server allowing further allocation of Session Graphics Memory.

Cheers
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