# OS X: Psychtoolbox bug report

**URL:** <https://psychtoolbox.discourse.group/t/os-x-psychtoolbox-bug-report/725>\
**Category:** Uncategorized\
**Created:** [October 26, 2004, 8:27pm UTC](https://psychtoolbox.discourse.group/t/os-x-psychtoolbox-bug-report/725 "2004-10-26T20:27:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ingling7](https://avatars.discourse-cdn.com/v4/letter/i/e79b87/32.png) [@ingling7](https://psychtoolbox.discourse.group/u/ingling7)\
**Post date:** [October 26, 2004, 8:27pm UTC](https://psychtoolbox.discourse.group/t/os-x-psychtoolbox-bug-report/725/1 "2004-10-26T20:27:13Z")

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On Oct 26, 2004, at 10:17 AM, Aaron Schurger wrote:  
  

> \> Dear Allen,  
> \> I was not sure to whom I should report a possible bug that I have   
> \> identified in Psychtoolbox for OSX.

No problem, though it is usually better to post bug reports to the   
public Psychtoolbox forum at [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com). I am   
copying this reply to the forum.  
  
When posting to the forum, please indicate OS9, OSX, or WIN version in   
the subject line and include your full name.  
  

> \>  
> \> Circumstances:  
> \> I attempt to draw two different images to different locations on the   
> \> screen, as follows (rgb1 and rgb2 are MxNx3 RGB matrices):  
> \> LeftEye = rgb1;  
> \> RightEye = rgb2;  
> \> % then we make a texture  
> \> Ltex = Screen('MakeTexture',w,LeftEye\*255);  
> \> Rtex = Screen('MakeTexture',w,RightEye\*255);  
> \> % then draw the texture to the screen  
> \> Screen('DrawTexture',w,Rtex,[],RightRect);  
> \> Screen('DrawTexture',w,Ltex,[],LeftRect);  
> \> Screen('Flip',w);  
> \>  
> \> Problem:  
> \> The second image that I draw appears identical to the first one, even   
> \> though the two images are different.  
> \>

Would you be willing to send the simplest complete script which   
demonstrates the problem? The bug could depend on the details of other   
parts of your script not shown in the excerpt which you gave. If I   
filled in those parts here, I might not write the program in the same   
way you did, and so not be able to reproduce the bug.  
  
  
best,  
  
Allen  
  
  
Allen W. Ingling  
Assistant Research Scientist  
Center for Neural Science  
New York University