[Bugs] #2188 UNSP: read pixel pushes an int to stack

[Sugar Labs Bugs]

#2188: read pixel pushes an int to stack
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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:  dextrose                   
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by walter):

 I suppose that if shade or gray are not at 50, 100 respectfully, I could
 try to do a conversion before trying to map to the palette. (Originally I
 was going to ignore these cases as being inherently too noisy, but I'll
 test it.)

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2188#comment:10>
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