Images and Color

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• Misc
  • Workshop for students interested in applying to REUs
    • Monday January 26
    • South 328
    • 5:30 PM
    • Prof. Macula
  • Online access to course documents
    • Via my home page or myCourses
• Questions?
• Images
  • How are they represented?
    • 3D Matrix
      
  • How to do it in Matlab
    

    >> img = zeros( 512, 512, 3 );
    >> image( img )
    >> img( 1:10, :, 1 ) = 1;
    >> image( img )
    >> help axis
    …Lots of information about using “axis” command…
    >> axis off
    >> img( 100:200, 100:200, 1 ) = 0.5;
    >> img( 100:200, 100:200, 2 ) = 0.5;
    >> image( img )
    >> img( 100:200, 100:200, 1 ) = 0.85;
    >> img( 100:200, 100:200, 2 ) = 0.85;
    >> image( img )
    >> img( 100:200, 100:200, 3 ) = 0.5;
    >> image( img )
    >> img( 100:200, 100:200, 3 ) = img( 100:200, 100:200,3 ) + 0.3;
    >> image( img )
    >> imwrite( img, 'demo.jpg' )

  • Forming an image with rays
    
• Next
  • Representing and coding rays

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