# Help: Image Quality problem in the 2nd monitor (projector), WinXP

**URL:** <https://psychtoolbox.discourse.group/t/help-image-quality-problem-in-the-2nd-monitor-projector-winxp/1016>\
**Category:** Uncategorized\
**Created:** [November 20, 2006, 4:19pm UTC](https://psychtoolbox.discourse.group/t/help-image-quality-problem-in-the-2nd-monitor-projector-winxp/1016 "2006-11-20T16:19:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [November 20, 2006, 4:19pm UTC](https://psychtoolbox.discourse.group/t/help-image-quality-problem-in-the-2nd-monitor-projector-winxp/1016/1 "2006-11-20T16:19:04Z")

</div>

HI,  
I tried Grating, Random white noise and single bar moving in the  
primary monitor and 2nd monitor(projector) in two WIN XP pcs. The same  
result is that the presentation in the 1st display (LCD, 60 Hz) is  
very smooth, while it shows flicker in the 2nd monitor sometimes  
during the operation. Is there any way to overcome this problem? ( I  
have not test yet to put the projector as primary and LCD as the 2nd)  
  
Meanwhile I have a DirectShow program (under MS C++) to present the  
grating and noise. I switch to the psychtoolbox because I can not get  
enough flexibility from this Directrshow program. Under the same  
hardware setting and connection, I tested the image quality in the  
projector. For example, When the drift of grating between each frame  
is set to 5 pixels, the projector image is still smooth under  
DirectShow program, but flicker is shown under Matlab. Could someone  
give some suggestion?  
  
Thanks.  
  
WJ