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changing a picture into black and white and grayscale error message

Posted on 2009-04-20
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I am studying the Imaging Processing Toolbox tutorial and under the 'Example 2  Advanced Topics' chapter, everything is fine until I get to 'Step 5: Adjust the Contrast in the Processed Image'. I get the following error;

??? Error using ==> imadjust>parseInputs at 212
IMADJUST(I) is only supported for 2-D grayscale images.

Error in ==> imadjust at 98
[img,imageType,lowIn,highIn,lowOut,highOut,gamma] = ...

when I enter I3=imadjust(I2);

Can someone please advise why this is?
I am trying to change the picture below into black and white and grayscale
What does this mean
lightbulb.jpg
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Question by:jtiernan2008
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jtiernan2008 earned 0 total points
ID: 24189460
figured it out :)
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