# OPENCV

Name | contrast()
Examples |
    import hypermedia.video.*;

    OpenCV opencv;

    void setup() {

        size( 320, 240 );

        opencv = new OpenCV(this);
        opencv.capture( width, height );
    }

    void draw() {

        opencv.read();
        opencv.convert( GRAY );
        opencv.ROI( 110, 70, 100, 100 );
        opencv.brightness( 80 );
        opencv.contrast( 90 );

        image( opencv.image(), 0, 0 );
    }
Description | Adjust the image contrast with the specified value (in range of -128 to 128).
Syntax | `contrast(value);`
Parameters |
value | int : the new contrast value
Return | None
Usage | Application
Related | brightness()