Clippings/QTVideo.c/CompressImage.txt

            err = CompressImage(GetPortPixMap(theGWorld), /* source image to compress */
                                trackFrame,               /* bounds */
                                codecNormalQuality,       /* desired image quality */
                                kAnimationCodecType,      /* compressor identifier */
                                imageDesc,                /* handle to Image Description Structure; will be resized by call */
                                compressedDataPtr);       /* pointer to a location to recieve the compressed image data */