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Using thresholding correctly

Hello everyone. I've been trying to do some vision stuff with LabVIEW's VDM and was having trouble with contrast, so I decided to try thresholding the image and working with the modified image. I can't figure out why my threshold function isn't working correctly. I've included a ss of the block for my VI for those of you without LabVIEW2009.

 

Thanks.

Using LabVIEW 2009 on Windows Vista
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which format of the image are you trying to threshold. If you want to threshold an RGB image (JPG for ex). Then you have to convert that into a grey scale image (Extract color planes). If you want to threshold a RGB image directly then use "Color thresholding"
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