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Here are the steps to follow!

1. Threshold your input image in the Range 2000-3000;

2. Convert To 8 bit using the new min max value like this

   double min=2000; double max=3000; src.convertTo( dis, CV_8U, 255.0/(max-min), -min);

Here are the steps to follow!

1. Threshold your input image in the Range 2000-3000;

2. Convert To 8 bit using the new min max value like this

   double min=2000; double max=3000; max=3000;

   src.convertTo( dis, CV_8U, 255.0/(max-min), -min);