[caret-users] Why does lighting and opacity selection not make any difference?

[Yune S. Lee]

Hello John,
Thanks a lot for the great answer with attached files to such a trivial 
question.
I was looking at the flat map and that's why I didn't see any 
difference.  :-( (It would be better if the next version can also 
support it).

Thanks,
YSL



John Harwell wrote:
>
>
>
> Lighting alters the surfaces colors by approximating the absorption 
> and reflection of light on the surface.  Since lighting affects the 
> surface coloring, some user's prefer to disable lighting for an 
> overlay displaying functional (metric) data.  Lighting is applied only 
> to three-dimensional surfaces.  Lighting is not applied to flat 
> surfaces.  The overlay must be set to a Data Type other than NONE for 
> the overlay's lighting control to have an effect.
>
> Images showing metric data on primary overlay with and without 
> lighting.  Notice that the surface without lighting loses its 
> three-dimensional appearance.
>
>
> ------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------
>
>
>
>
> Opacity allows blending of the overlay with the underlaying coloring.  
> If its value is 1.0, the overlay is opaque meaning that the overlay's 
> coloring completely overrides any underlaying coloring.  If the 
> opacity value is zero, the overlay is fully transparent allowing all 
> of the underlaying color to show.  The overlay must be set to a Data 
> Type other than NONE for the overlay's opacity control to have an effect.
>
> Images with primary overlay set to metric and primary overlay opacity 
> set at 1.0 and and 0.3.  With a low opacity, the underlaying sulcal 
> pattern becomes apparent.
>
>
>
> ------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------
>
>
> Also see also: 
> http://brainvis.wustl.edu/CaretHelpAccount/caret5_help/dialogs/display_control_dialog.html#OU_Surface 
>
>
>
> John
>
>
>
>
> On Apr 13, 2009, at 1:25 PM, Yune S. Lee wrote:
>
>>
>> Dear caret users,
>> I have a trivial question regarding lighting and opacity in the
>> overlay/ underlay-surface .
>> I've been playing around with lighting (check or uncheck) and opacity
>> values to see what's changing in the graphic, but I didn't notice any
>> difference in my workstation.  So, I wonder why this happens and what I
>> am supposed to see depending on different setting (e.g., what would have
>> happened when lighting
>> is unchecked?) Any help would be appreciated.
>>
>> thanks,
>> YSL
>>
>>
>>
>> _______________________________________________
>> caret-users mailing list
>> caret-users at brainvis.wustl.edu
>> http://brainvis.wustl.edu/mailman/listinfo/caret-users
>>
>
>
> ------------------------------------------------------------------------
>
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>   

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