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Shortest way:

 float alpha, beta = ...

Mat image = imread( argv[1] );

Shortest way:way via matrix expressions:

 float alpha, beta = ...

Mat image = imread( argv[1] );

Shortest way A quick and dirty contrast enhancement via matrix expressions:expressions and a linear transformation:

 float alpha, beta = ...
 Mat image = imread( argv[1] );
 image += beta;
 image *= alpha;

A quick and dirty contrast enhancement via matrix expressions and a linear transformation:

 float alpha, beta = ...
 Mat image = imread( argv[1] );
 image += beta;
 image *= alpha;

For instance, set beta beta to -(minimum value) and alpha alpha to (maximum value - minimum value).