[Bugs] #2651 UNSP: brightness uses agc

[Sugar Labs Bugs]

#2651: brightness uses agc
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    Reporter:  tonyforster                |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Turtleart                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  Unspecified                
   Seeta_dev:                             |  
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Comment(by tonyforster):

 brightness is not linear because AGC is not disabled, the attached files
 disable AGC by keeping the camera open between reads

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2651#comment:2>
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