Invert by accord 

// create filter
Invert filter = new Invert( );
// apply the filter
filter.ApplyInPlace( image );

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ofImage ofxOpenCV

//-------------------------------------------------------------- void ofApp::setup(){     image1.load("D:/2.bmp");     image1.mirror(FALSE, TRUE);     image1.resize(512, 512);     image1.crop(10, 10, 256, 256);     image1.saveImage("D:/after.png", OF_IMAGE_QUALITY_BEST); } //-------------------------------------------------------------- void ofApp::update(){     } //-------------------------------------------------------------- void ofApp::draw(){     image1.draw(0, 0); }
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