[Chimera-users] heavy black awful nuisance grid

Tom Goddard goddard at cgl.ucsf.edu
Tue Sep 16 14:14:52 PDT 2008

Barry reports that supersample 1x1 did not remove the black grid on his 
Chimera images.


Barry Lever wrote:
> Tom: Thanks for suggestion- but alas it did not   resolve the 
> problem.  I have run Chimera on 3 computers, 2 give me this grid  
> problem, but the third works fine so the issue is not critical- I can 
> use the third computer for graphics. It has been suggested that the 
> problem relates to using a generic graphic video card on one of these 
> 'bad' computers
> but I doubt this is the reason since previously this 'bad'  computer 
> did not give me a  black grid problem- but the problem may have arisen 
> when I upgraded to the latest version of Chimera.
> Thanks for your thoughts
> Barry
> Thomas Goddard wrote:
>> Hi Barry,
>>   This is very likely a problem related to "supersampling", an option 
>> for producing higher quality images with Chimera.  You should try 
>> changing the supersample setting in the File / Save Image... dialog.  
>> I suspect 1x1 will not give the grid but the fonts won't look as good 
>> in the image.  The normal 3x3 setting makes an image 3 times larger 
>> in both dimensions then averages it down to your requested size.  
>> That smooths out jagged edges.  You can get a similar effect by using 
>> 1x1 (no supersampling) then make a bigger image and reduce its size 
>> in a photo editing program (photoshop, gimp).
>>     Tom
>> Barry Lever wrote:
>>> AS a new user of Chimera, I apologize for asking what , for many of 
>>> you, is probably a trivial question.... initially when using Chimera 
>>> ,creating an image  (using pseudobond Reader)  and then saving an 
>>> image file, (save image) all worked well, but in the last couple of 
>>> days,  every time I save an image file in whatever mode (png, tif, 
>>> jpg etc), I get my image with a heavy black grid across it.(and on 
>>> two different computers).
>>> I am using Chimera 1.254.  Is there a  simple fix- it feels like a 
>>> conflict.
>>> I attach one of the images
>>> Thanks for your help (Windows XP, SP3)
>>> Barry

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