HI, I am writing an app which does pixel by pixel comparison. I chose to use Qt because it seems to have plenty of really usable functionality and more importantly documentation that I can understand. The is one line of code which on diagnosis is the casue of my problems (the rest of my code runs at an acceptable rate). I am taking a screen grap(this occurs quickly enough), then using "pixmap.save()" to load a "BMP formated Image into a buffer. ie; QPixmap pmap; QByteArray array; QBuffer buf( array ); if ( !pmap.save( &buf, "BMP" ) ) cout << "error newImage to buffer" << endl; Since this process involves convert to a QImage and then writing to the buffer it is creating a bottle neck. It takes around 300ms. Is there a faster way to acheive the same result? eg. read straight to the memory buffer from the pixmap without the conversion step.